Teaching the bible: "Those who are in the realm of the flesh cannot please God", Romans 8:8.
Paul in his letter to the Romans reminds us that the flesh is everything that is in man, that opposes God: "Those who are in the realm of the flesh cannot please God", Romans 8:8. In the bible, the flesh represents the fallen nature of man due to original sin, Adam eats the apple of the tree that God had forbidden him, and because of that sin death enters the world. Living according to the flesh is, in practical terms, leading a life full of sins ("If anyone, then, knows the good they ought to do and doesn't do it, it is sin for them", James 4:17)
Not pleasing God means that those who live according to the flesh cannot inherit the kingdom of God, Kingdom of God means empire dominion of God's perfections: empire of wisdom, kingdom of mercy, rule of godliness.
In colossians 1:10 is explained in what consist to please God: "so that you may live a life worthy of the Lord and please him in every way: bearing fruit in every good work, growing in the knowledge of God."
The bible tells us that those who please God are those whom He loves: "God loves nothing so much as the man who lives with wisdom", Wisdom 7:28.
Pleasing God is living according to the spirit: "Be perfect, therefore, as your heavenly Father is perfect", Matthew 5:48; "Be merciful just as your Father is merciful", Luke 6:36; "Be holy, because I am holy" 1 Peter 1:16.
When we please God our lives bear fruits of life, whereas when we oppose God we bear fruits of death:
"The acts of the flesh are obvious: sexual immorality, impurity and debauchery; idolatry and witchcraft; hatred, discord, jealousy, fits of rage, selfish ambition, dissension, factions and envy, drunkenness, orgies and the like. I warn you, as I did before, that those who live like this will not inherit the kingdom of God.
But the fruit of the spirit is love, joy, peace, forbearance, kindness, goodness, faithfulness, gentleness and self-control. Against such things there is no law"; Galatians 5:19-23.
The flesh and the spirit represents mentalities, paths and retributions.
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