...be tolerant with others and strict with yourself. Remember, nothing belongs to you but your flesh and blood—and nothing else is under your control. Book V
Remember that impact is the product of two factors: population multiplied times impact per person. Collapse: How Societies Choose to Fail or Succeed
The distinguishing property of man is to search for and to follow after truth. Therefore, when relaxed from our necessary cares and concerns, we then covet to see, to hear, and to learn somewhat; and we esteem knowledge of things either obscure or wonderful to be the indispensable means of living happily. On Duties
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