כְּבוֹלְעוֹ כָּךְ פּוֹלְטוֹ

ביטוי (אנגלית)

As it absorbs, so it emits/ light come light go/ in at one ear, out at the other/to learn quickly and forget as soon

הגדרה (אנגלית)

In the question: He who understands and receives quickly is also quick to forget. "He who hears quickly is quick to lose" (in the source: the meaning of a vessel made of a material capable of receiving and releasing food substances from its contents, a discussion of the meaning of hearing in the laws of kosher)

(“As it absorbs, so it emits; what it absorbed in sparks, it also emits in sparks” - Avodah Zarah 76b)