Chronic remorse is the most undesirable sentiment. If you behaved badly, repent, make what amends you can and address yourself to the task of behaving better next time. On no account brood over your wrong doing because rolling in the muck is not the best way of getting clean. The badness should be hunted out, acknowledged and, if possible, avoided in the future.
Sanity is impossible. On the contrary, sanity is a rather rare phenomenon. It can be achieved and would like to see more it.
-- Brave New World.