"Be as careful of the books you read, as of the company you keep; for your habits and character will be as much influenced by the former as by the latter."
"Be very circumspect in the choice of thy company. In the society of thine equals thou shalt enjoy more pleasure; in the society of thy superiors thou shalt find more profit. To be the best in the company is the way to grow worse."
"Beware of dissipating your powers; strive constantly to concentrate them. Genius thinks it can do whatever it sees others doing, but is sure to repent of every ill-judged outlay."