“And acquire for yourself a friend” (m. Avot 1:6). How is this to be done? This teaches that one should acquire a companion and that they should eat together, drink together, read together, study together, sleep together, and reveal their secrets to one another: the secrets of Torah and the secrets of worldly matters. For when they sit and occupy themselves with Torah and one of them makes an error in a matter of reasoning, then her companion will return her to the correct reasoning. And from where in Scripture can we learn that when her companion guides her and studies with her, that they receive a good reward for their labor? As it is said, “Two are better than one, for they have a good reward for their labor” (Ecclesiastes 4:9).