אות - קכט

The primary strengthening of the known desire — the desire of intercourse — comes only from sadness and melancholy. And one must strengthen oneself with all one's might to always be only joyful. And he said: even when one falls sometimes into mud and mire from which it is very hard to emerge — one cries out and cries out and cries out (and he said in German: "in afile az mefalt in ah blati arain, shrait men in me shrait in me shrait" [and even when one falls into the mud, one cries out and one cries out and one cries out]). And he raised his hands slightly and said no more. And he said: regarding the thoughts and confusions that confuse a person in this matter — "sufficient for the trouble is the hour thereof" (Berachos 9b) — and one should not confuse oneself at all in this matter, neither before nor after.