“Adam 'preferred himself” to God…" Again in my mind this seems like egotism/pride and so (to my way of thinking) pride, arrogance, egotism, is/are the definition of original sin. It seems black and white to me but apparently things are more complicated than they seem.
Pride may be a *cause *of original sin, since it exalts itself above everything including God, and is also a
consequence of original sin as humankind remained in that separated state after the fall, carrying on the “family tradition”, so that scripture tells us in Prov 6 & 21 that God hates a “haughty look” or “haughty eyes” and in Prov 29 that “God opposes the proud, but gives grace to the humble”. Because pride, by its nature, opposes God.
But Aquinas teaches that the* state* of original sin that humankind inherited is more basic than that I think. He teaches that original sin is a disease, a privation: “the privation of original justice, whereby the will was made subject to God, is the formal element in original sin.” When man’s will is subject to God, he is in a state of justice.
Now we’re born into a state of being separated from/turned away from God-and all other sin follows from that state. Is pride the
equivalent of that state? I don’t think so even though it’s part and parcel of it. In any case Aquinas tells us that pride is the most grievous of sins because it is contempt of God, aversion from Him and His commandments. Pride/self-righteousness certainly is responsible in one way or another for the worst of the atrocities that take place in our world.