An example would be if we perceived a need to have friends and we did not trust God to provide good friends for us. This would be the first step of sin. Second, we might then begin to do whatever we thought was necessary to win friends by ourselves which might include compromising what we believe. To those who by persistence in doing good seek glory, honor and immortality, he will give eternal life. But for those who are self-seeking and who reject the truth and follow evil, there will be wrath and anger.
Sin is a selfish attitude in our heart.
Self-seeking means we are concerned for ourselves more than others. Our own interests are our chief concern. Sin begins with being selfish in our heart and results in disobedience in our behavior. We all inherit a sin nature from Adam. Surely I was sinful at birth, sinful from the time my mother conceived me.