the fall

from here http://www.calledtocommunion.com/2009/03/aquinas-and-trent-part-2/

When Adam sinned by his free will, which is a power of reason, he turned away from obedience to God, and therefore failed to give God His due. As a result of this act of injustice, the lower two subjections (i.e. the subjection of the lower powers of the soul to reason, and the subjection of body to soul) were destroyed. Even the harmony between man and woman was lost, as was the harmony between man and man (e.g. Cain and Abel), and that between man and nature, for nature was originally subject to man.