You cant understand this:
8 So then they that are in the flesh cannot please God.
Do you know who that is ? " they that are in the flesh " They that are in the flesh are the unregenerate, never born of the Spirit, they are without the Spirit. So they cannot please God
Before salvation we are all in the flesh.
Alive with Christ
…2in which you used to walk when you conformed to the ways of this world and of the ruler of the power of the air, the spirit who is now at work in the sons of disobedience. 3
All of us also lived among them at one time, fulfilling the cravings of our flesh and indulging its desires and thoughts. Like the rest, we were by nature children of wrath. 4But because of His great love for us, God, who is rich in mercy,…Ephesians 2:3-4
Galatians 5:16-17
So I say, walk by the Spirit, and you will not gratify the desires of the flesh. / For the flesh craves what is contrary to the Spirit, and the Spirit what is contrary to the flesh. They are opposed to each other, so that you do not do what you want.
Colossians 3:5-7
Put to death, therefore, the components of your earthly nature: sexual immorality, impurity, lust, evil desires, and greed, which is idolatry. / Because of these, the wrath of God is coming on the sons of disobedience. / When you lived among them, you also used to walk in these ways.
1 Peter 4:3
For you have spent enough time in the past carrying out the same desires as the Gentiles: living in debauchery, lust, drunkenness, orgies, carousing, and detestable idolatry.
Titus 3:3
For at one time we too were foolish, disobedient, misled, and enslaved to all sorts of desires and pleasures—living in malice and envy, being hated and hating one another.
James 1:14-15
But each one is tempted when by his own evil desires he is lured away and enticed. / Then after desire has conceived, it gives birth to sin; and sin, when it is full-grown, gives birth to death.
1 John 2:16
For all that is in the world—the desires of the flesh, the desires of the eyes, and the pride of life—is not from the Father but from the world.
1 Corinthians 2:14
The natural man does not accept the things that come from the Spirit of God. For they are foolishness to him, and he cannot understand them, because they are spiritually discerned.
Jeremiah 17:9
The heart is deceitful above all things and beyond cure. Who can understand it?
Genesis 6:5
Then the LORD saw that the wickedness of man was great upon the earth, and that every inclination of the thoughts of his heart was altogether evil all the time.
Psalm 51:5
Surely I was brought forth in iniquity; I was sinful when my mother conceived me.
Isaiah 53:6
We all like sheep have gone astray, each one has turned to his own way; and the LORD has laid upon Him the iniquity of us all.
Isaiah 64:6
Each of us has become like something unclean, and all our righteous acts are like filthy rags; we all wither like a leaf, and our iniquities carry us away like the wind.
Treasury of Scripture