Carnal mind refers to the inclination of thoughts to the lust of the body. When you live by the flesh, you will do what you naturally want to do according to the lust of the flesh. Examples of a canal mind are greed, wickedness, malice, and hatred. If you have the fruit of the spirit, you will do what Jesus would do. We are to follow the examples of Jesus Christ while he was on earth. If you are led by the spirit, you are the child of God. As a born again Christian, you are supposed to get rid of all kinds of sinful behaviors, attitude and thoughts. Sin refers to anything that is against God’s commandments.
A Christian cannot live by the flesh and spirit at the same time. God commanded us to fight against the lust of the flesh. We are to fight over every kind of fleshly deed including emotions, thoughts, and decisions. Christians who are compromising with the world will live by the spirit and flesh. These types of Christians are inconsistent. The strength of the spirit and flesh in them are about the same. They will have some victories as well as some defeat in their lives. Backslidden Christian has much stronger fleshly desire compared to compromising Christian. No one will be able to know that a backslidden Christian is saved. Victorious Christians who live by the spirit and will never compromise to the flesh. Everyone will be able to know that he is a Christian led by the spirit.
Christians must not let the flesh to overpower them. It is possible for a Christian to make backward progression when he is not carefully following God. To avoid this, you should do spiritual activities by spending time with God. Examples of activities you can do to be closer with God are prayer, bible, encouraging others and etc. God promises to give the crown of life to anyone who finishes the race of life. We are to die daily in the flesh. Jesus promises to give a new body to the followers who have victoriously finished the race of life.
Satan is the eternal enemy of our soul. Satan is real and active and always looking for vulnerable people to attack. Satan wants us to live in flesh much more than we immerse in the Lord. He does not care what you do but he wants to make sure you are not with God. The devil likes to grab our weakest point to attack us. We must never give any way to the devil so that he cannot carry out his plan on us and destroy our relationship with God.
But the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned. (1 Corinthians 2:14 KJV)
Now I beseech you, brethren, mark them which cause divisions and offences contrary to the doctrine which ye have learned; and avoid them. (Romans 16:17 KJV)
But the fearful, and unbelieving, and the abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all liars, shall have their part in the lake which burneth with fire and brimstone: which is the second death. (Revelation 21:8 KJV)
So then they that are in the flesh cannot please God. (Romans 8:8 KJV)
This I say then, Walk in the Spirit, and ye shall not fulfil the lust of the flesh. (Galatians 5:16 KJV)
Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness, Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies, Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God. (Galatians 5:19-21 KJV)
For they that are after the flesh do mind the things of the flesh; but they that are after the Spirit the things of the Spirit. For to be carnally minded is death; but to be spiritually minded is life and peace. (Romans 8:5-6 KJV)
There hath no temptation taken you but such as is common to man: but God is faithful, who will not suffer you to be tempted above that ye are able; but will with the temptation also make a way to escape, that ye may be able to bear it. (1 Corinthians 10:13 KJV)
If ye then be risen with Christ, seek those things which are above, where Christ sitteth on the right hand of God. Set your affection on things above, not on things on the earth. For ye are dead, and your life is hid with Christ in God. When Christ, who is our life, shall appear, then shall ye also appear with him in glory. (Colossians 3:1-4 KJV)