Pirkei Avot §avot_02_05: He used to say: A brute is not sin-fearing, nor is an ignorant person pious; ...

He used to say: A brute is not sin-fearing, nor is an ignorant person pious; nor can a timid person learn, nor can an impatient person teach; nor will someone who engages too much in business become wise. In a place where there are no men, strive to be a man.