If there be light, then there is darkness; if cold, then heat; if height, depth also; if solid, then fluid; hardness and softness, roughness and smoothness, calm and tempest, prosperity and adversity, life and death.
It is better either to be silent, or to say things of more value than silence. Sooner throw a pearl at hazard than an idle or useless word; and do not say a little in many words, but a great deal in a few.
It is only necessary to make war with five things: with the maladies of the body, the ignorances of the mind, with the passions of the body, with the seditions of the city, and the discords of families.
Let not sleep fall upon thy eyes till thou hast thrice reviewed the transactions of the past day. Where have I turned aside from rectitude? What have I been doing? What have I left undone, which I ought to have done? Begin thus from the first act, and proceed; and in conclusion, at the ill which thou hast done, be troubled, and rejoice for the good.