Musar for Ketubot 118:7
רבי אליעזר אומר אפי' הכניסה לו מאה שפחות כופה לעשות בצמר שהבטלה מביאה לידי זימה רשב"ג אומר אף המדיר את אשתו מלעשות מלאכה יוציא ויתן כתובה שהבטלה מביאה לידי שיעמום:
Rabbi Eliezer says: even if she brought him a hundred slave-women he may compel her to work in wool; for idleness leads to unchastity. Rabbi Shimon ben Gamaliel says: if a man forbade his wife under a vow to do any work he must divorce her and give her kethubah to her for idleness leads to insanity.
Orchot Tzadikim
And the Sages also said, "If it were not for the fact that a man forgets the Torah if he does not study it constantly, he would learn all of the Torah and after that he would go idle, and idleness leads a person to boredom and to sin (Kethuboth 5:5; Aboth de-Rabbi Nathan chap. 11). Therefore, it was decreed that the Torah is easily forgotten, so that man would occupy himself with Torah all of his days, and thus not come to sin.
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