The rule of friendship means there should be mutual sympathy between them, each supplying what the other lacks and trying to benefit the other, always using friendly and sincere words.
This, therefore, is a law not found in books, but written on the fleshly tablets of the heart, which we have not learned from man, received or read, but which we have caught up from Nature herself, sucked in and imbibed; the knowledge of which we were not taught, but for which we were made; we received it not by education, but by intuition.
There is no treasure the which may be compared unto a faithful friend; Gold some decayeth, and worldly wealth consumeth, and wasteth in the winde; But love once planted in a perfect and pure minde indureth weale and woe; The frownes of fortune, come they never so unkinde, cannot the same overthrowe.