It has been said, 'time heals all wounds.' I do not agree. The wounds remain. In time, the mind, protecting its sanity, covers them with scar tissue and the pain lessens. Bet it is never gone. by Rose Kennedy
It heavily implied that Hotch was abused as a child, and as horrific as child abuse is, I really wish they had explored more of that or dropped more hints (other than Hotch being more worked up than usual over child abuse cases).