I think all sin stems from the one of the greatest sins, selfishness or self-love. What I mean is that when people are only thinking about themselves, they do things only for themselves and not for God or anyone else. Love of self is dangerous because it destroys every one of the fruits of the Spirit and gives us the same view of things as Satan gave Eve in the Garden. It is the very opposite of Christ’s nature and the nature of the Virgin Mary. When people are self-centered they are blind to everything else, including God and His Law.