Letters 87.25

You are mistaken, I maintain, if you propose to reserve your punishments for the hangman or the prison; the crime is punished immediately after it is committed; nay, rather, at the moment when it is committed. Hence, good does not spring from evil, any more than figs grow from olive-trees. Things which grow correspond to their seed; and goods cannot depart from their class. As that which is honourable does not grow from that which is base, so neither does good grow from evil. For the honourable and the good are identical.

Seneca, Letters to Lucilius 87.25, translated by Richard Mott Gummere