Musar for Ketubot 118:12
ונפלגו בכתובה בעלמא ועוד תניא בש"א אינה מניקה אלא מחוורתא מתניתין דלא כב"ש:
Then let them dispute with regard to the ketubah in general. Furthermore, it was taught: Beth Shammai said: She is not obligated to nurse her child. Rather, clearly our mishnah is not in agreement with Bet Shammai.
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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