וְיִֽעֲפ֥וּ נְעָרִ֖ים וְיִגָ֑עוּ וּבַחוּרִ֖ים כָּשׁ֥וֹל יִכָּשֵֽׁלוּ׃
Los mancebos se fatigan y se cansan, los mozos flaquean y caen:
Duties of the Heart
(6) The alchemist is not immune from sickness and disease which hinders his joy in being wealthy, and prevents him from benefiting from what he has and enjoying what he has acquired. But one who trusts in G-d, is immune from sickness and disease except as an atonement or to increase his reward, as written "Now youths shall become tired and weary, and young men shall stumble" (Yeshaya 40:30), "those who hope in G-d will renew strength" (Yeshaya 40:31), and "For the arms of the wicked shall be broken, but the L-ord supports the righteous" (Tehilim 37:17).