https://wist.info/schopenhauer-arthur/22840/
<i>Parerga and Paralipomena</i>, Vol. 1, "Aphorisms on the Wisdom of Life <i>[Aphorismen zur Lebensweisheit]</i>," ch. 5 "Counsels and Maxims <i>[Paränesen und Maximen]</i>," § 2.15 (1851) [tr. Saunders (1890)]