Moussar sur Les Psaumes 64:7

יַֽחְפְּֽשׂוּ־עוֹלֹ֗ת תַּ֭מְנוּ חֵ֣פֶשׂ מְחֻפָּ֑שׂ וְקֶ֥רֶב אִ֝֗ישׁ וְלֵ֣ב עָמֹֽק׃

Ils s'ingénient à inventer de mauvais coups, exécutent des plans bien médités: l'être intime de l'homme, son cœur, est insondable.

Pele Yoetz

The letter "Yud": REVERENCE - with reverence you cannot go wrong because it to guards against all evil. It is known that there is an external reverence, which fears punishment in this world and the next, for many pains afflict the wicked and reproofs for sin, to the extent that no one can fathom the great evil that the soul of the wicked endures in the world to come. They say that if a person were to suffer in his life as Job suffered, it would not be as a drop in the sea against the anguish of the day of death. And all the anguish of the day of death is not as a drop in the sea against the sufferings of the world to come, which empower the wicked to endure their suffering. Those who pass through the valley of weeping shall turn it into a spring (Psalm 84:7). Our sages, may their memory be a blessing, interpreted (Eruvin 19a) that we cause rivers of tears to flow. Indeed, a person must, while in this world, protection for his soul and consider the benefit for a transgression relative to its loss. He should have complete faith and believe that the Holy One, blessed be He, doesn’t become permissive even for the smallest moment.