No yield to the dead! Never stab the fighter when he's down. Where's the glory, killing the dead twice over? - Sophocles

Take these things to heart, my son, I warn you.
All men make mistakes, it is only human.
But once the wrong is done, a man
can turn his back on folly, misfortune too,
if he tries to make amends, however low he's fallen,
and stops his bullnecked ways. Stubbornness
brands you for stupidity - pride is a crime.

Not to be born at all
Is best, far best that can befall,
Next best, when born, with least delay
To trace the backward way.
For when youth passes with its giddy train,
Troubles on troubles follow, toils on toils,
Pain, pain forever pain;
And none escapes life's coils.
Envy, sedition, strife,
Carnage and war, make up the tale of life.

Men of ill judgment oft ignore the good that lies within their hands, till they have lost it.