He sins because we are inclined to sin.
We are inclined to do what we think is best in the moment. I cannot argue this, it has to be verified by the individual. One has to examine his past actions, and rather than condemn, seek to understand. We are inclined toward satisfaction, fulfillment, but desire blinds us.
He is weak and gives in to desire and doesn’t rely on God to help him.
Yes, it can be seen as a human “weakness” that we become blinded to the significance of our own consciences. However, this blindness in itself has a purpose in our nature, and is beautiful in function. We can look back and say “I should have… I shouldn’t have…” but like the crowd who hung Jesus, when we are caught up in desire these moral precepts lose their weight. Later, when we are regretting, the precepts regain their significance. At the later state, we are in a position of “full knowledge and full consent”, not when we are caught up in desire.
If he were to look for the way of escape that God always gives us to avoid sin whenever we are tempted, he would actually be able to resist and this gets easier with practice.
The “practice” is in contemplative prayer. It means being in connection with God at the moment, which is rare and involves a lot of discipline. Most people walk around fairly unconscious.
Not all people do regret sins, though… resentment is an example of this.
We are using “resentment” differently, I think. I am using it as “holding something against someone”.
People who do not regret sins have a poorly developed conscience.
his selfishness kicked in
All desires are essentially for the benefit of the self. God wants us to take care of ourselves.
He put this desire, this love of self, before God and before his knowledge of right and wrong
This is the accusation, but this “putting before” is not deliberate in terms of intent (with some rare exceptions also involving blindness). Again, you would have to verify this in yourself. Think of a past sin, did you
intend to downplay God, or did you want to stay with God, and do the sin too? I am sure you had this going on in a mind distorted by desire.
it’s like a downward spiral. Sin begets sin.
When we discipline ourselves to sin, we repress the desires and ideas that lead to sin. “What is repressed gets expressed” as the saying goes. The repressed desires will come to overwhelm us in certain circumstances. The way to deal with this is a life of prayer that leads to awareness in the moment, being able to step back from desire when it arises and just watch it, rather than push it down and condemn it.
We can reconcile with our God-given appetites.