Letters 14.16

And finally, the wise man regards the reason for all his actions, but not the results. The beginning is in our own power; fortune decides the issue, but I do not allow her to pass sentence upon myself. You may say: “But she can inflict a measure of suffering and of trouble.” The highwayman does not pass sentence when he slays.

Seneca, Letters to Lucilius 14.16, translated by Richard Mott Gummere