There is no such thing as a “sin nature.” The Bible never refers to the “sin nature.” It is a myth of modern theology. However, the Bible DOES teach a lot about the “flesh.” This study looks at 1 Corinthians 3:1-4 to learn what the flesh actually is, and what we are to live in the Spirit rather than in the flesh.

Note that this study is an excerpt from my Gospel Dictionary online course. This course considers 52 key words of the Gospel and thousands of biblical texts. The course contains over 100 hours Bible teaching. You can take the course by joining my online discipleship group.
So let us see what we can learn about the flesh from 1 Corinthians 3:1-4.
The Flesh in 1 Corinthians 3:1-4
And I, brethren, could not speak to you as to spiritual people but as to carnal, as to babes in Christ. I fed you with milk and not with solid food; for until now you were not able to receive it, and even now you are still not able; for you are still carnal. For where there are envy, strife, and divisions among you, are you not carnal and behaving like mere men? For when one says, “I am of Paul,” and another says, “I am of Apollos,” are you not carnal? (1 Corinthians 3:1-4)
The primary theme of 1 Corinthians concerns the actions, attitudes, behaviors, and beliefs of spiritual (Gk., pneumatikois) people versus the fleshly or carnal (Gk., sarkinois) people. Paul seeks to correct the Corinthian understanding of both ways of living. On the one hand, spiritual living does not mean that a person rejects the material world and engages in practices that makes one appear more spiritual to others. Instead, the spiritual person is a mature Christian who knows that all things in life are good, pleasing, and holy if accepted with thanks, and that true spirituality is shown through love and service toward others rather than through ecstatic experiences.
The carnal person, then, is the opposite of the spiritual person. The carnal person may appear to be quite “spiritual” and religious, but they are unable to grasp, understand, or practice the greater truths of Christianity which lead us lay down our lives for others in love and service to them. The carnal, or fleshly person is not necessarily one who gives in to the passions and lusts of the flesh, but is rather one who thinks that the chills and thrills of ecstatic religion makes them superior to others.
This is the truth Paul emphasizes in 1 Corinthians 3:1-3. Paul indicates that the Corinthian Christians are carnal, fleshly, and therefore, were not able to receive some of the more important truths about following Jesus that he would have liked to teach them. As indications of their carnality, Paul points to the “envy, strife, and divisions” among them. While such behaviors certainly are sinful, the context reveals what precisely was leading to these divisions within the Corinthian church.
The Corinthian church was dividing over who was a better teacher, Paul or Apollos, and who were better Christians based on whether they followed Paul or Apollos. Paul says that these sorts of religious arguments are sure indicators of a carnal mind. The spiritual person is one who overlooks such differences and works to live in love and unity with one another, as we all grow together into the church that God wants, built upon the foundation of Jesus Christ (1 Corinthians 3:5-17).
It is indeed true that some of the Corinthian Christians were engaging in sinful sensuality (cf. 1 Corinthians 5:1; 6:9-10). But when Paul uses a word to describe this sort of behavior, he does not use the word “flesh” to describe this behavior, but the word “unrighteous” (1 Corinthians 6:9). Yes, fleshly, carnal thinking leads to unrighteous behavior, which is why Paul instructs the Corinthians to hand a man over to Satan for the destruction of his flesh (1 Corinthians 5:5; see Satan for a discussion of what this means).
Fleshly thinking is not identical to unrighteous living, but is rather a cause of it. When a person puffs themselves up through religious pride, arrogance, and self-righteousness, this mentality eventually leads them into various forms of unrighteousness.
So even here in 1 Corinthians 3:1-4, the flesh is not described as sensual living, or any sort of “sin nature,” but is instead the religious mindset that causes people to condemn and accuse others in God’s name. It is a religious sense of superiority based on external behaviors such as ecstatic utterances and fervent conformity to religious laws. It is this same idea that Paul expands upon in more detail in 1 Corinthians 15:35-50, where he writes about the resurrection.
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But sending a runner was not always the best option. Runners could not be used when the distance was too far, when the message was too urgent, or when enemy forces were in the way. So the Roman military devised an ingenious solution for such situations. They developed a system of communication which could quickly send short messages over long distances and even to other units that were separated from the main force.








This bring up the third reason some prayers require perseverance. Sometimes, God does not immediately answer our requests because He wants us to remain in communication with Him. God is not playing games with us by making us wait for some of the things we request, but at the same time, God doesn’t want us to play games with Him.
Victor Walter also found that most prayers were for groups of people, rather than for individuals. If a prophet or apostle had an issue with a person or a solution for a problem they faced, they spoke directly to that person about it, rather than praying to God for it.
Indeed, Paul has firsthand knowledge and experience of this front line warfare, and he indicates this by describing himself as an ambassador in chains. Paul wrote the letter of Ephesians from prison, likely while being chained between two Roman guards. And he was in prison because he had declared the gospel, and was facing a death sentence for the same reason.


Remember, the strength and genius of the Roman military was their ability to stand firm and stay in once place on the field of battle, defending their small piece of land from any and all attackers. The shield served a significant role in this strategy.



Faith, as taught in the Bible, can be defined as a reasonable certainty about any truth claim or statement of fact.
When temptations do get through, and when we get wounded by the fiery darts of the devil, it is because we have dropped our shield. The only way the fiery darts of temptation get past the protective shield of God is when we have not properly taken up the shield of faith, as Paul instructions in Ephesians 6:16. When the shield drops, when we let down our guard, it is then that the fiery darts are able to get through and wound us.
So to grow our faith, to walk by faith, to live by faith, and to take up the shield of faith, we must begin with the facts and truths we know to be true, and then build upon these ideas with more truths and ideas from Scripture.
Do you see? As we come to learn and believe these promises of God, they become a shield and a barrier protecting us from all the lies of the devil.
The sandals of the Roman soldier were very similar to some sandals you might see today. They were made primarily from leather and were fastened to the feet with leather cords that went around the ankle and partway up the calf.
The Roman soldier sandals were fitted with metal spikes on the bottom of the sole. These spikes helped them maintain their footing. The spikes allowed them to—in the words repeated four times in 
The gospel is not just the good news about everlasting life and how to spend eternity with God. The gospel is also about how to live this life now, in friendship and fellowship with God and with each other, and also in fulfillment of who God made us to be. The teachings and example of Jesus show us the truth about all such things.
When you do not know that you are safe, your life becomes filled with doubt and fear, which causes you to stumble and fall into the mud and muck of life. You also become fearful of stepping out in faith to follow Jesus into dark and dangerous places on the battlefield of life.
Paul writes that we are to shod our feet with the preparation of the gospel of peace. The sandals are not precisely the gospel itself. Rather, the sandals are the preparation of the gospel.
Since there are so many gospel truths, this is why the gospel presentations of Christians becomes so garbled. Some Christians prefer to share one set of truths, while other Christians prefer to share a different set of truths.
When you keep this central truth in mind, you can share a lot of other gospel truths with others without sounding like you are speaking gibberish. You can share a lot of truths, or a few truths. You can answer questions and objections they might have. The gospel becomes simple to share with others, because you no longer have to worry if you have shared enough truth or the right truth. You have one simple truth to share, and everything else flows from that.
So when Christians start to use practices and phrases like these as a way to share the gospel, it gets confusing for them and for those who hear us.
Instead, you can step out in faith to follow Jesus without fear because you know that He will keep you safe and secure, no matter what.
When we live out the truths of the gospel, we will get rid of sin in our lives, because sin trips us up and causes us to stumble into the muddy ground at our feet. When we live out the truths of the gospel, we will love our enemies, forgive others, and serve those who mistreat us and abuse us.