Parents can only give good advice or put them on the right paths, but the final forming of a person's character lies in their own hands.

... no one can ever save someone else, you know? We can only save ourselves. You know that, don't you?

Attack the evil that is within yourself, rather than attacking the evil that is in others.

The final forming of a person's character lies in their own hands.

The fault, dear Brutus, is not in our stars, but in ourselves.

As someone very sagely said during the parricide trials of the Menendez Brothers: anytime your kids kill you, you are at least partly to blame.