A Law of Nature, (Lex Naturalis) is a Precept, or general Rule, found out by Reason, by which a man is forbidden to do, that, which is destructive of his life, or taketh away the means of preserving the same; and to omit, that, by which he thinketh it may be best preserved.
Thomas HobbesIf any two men desire the same thing, which nevertheless they cannot both enjoy, they become enemies.
Thomas HobbesWhen it happeneth that a man signifieth unto us two contradictory opinions whereof the one is clearly and directly signified, andthe other either drawn from that by consequence, or not known to be contradictory to it; then (when he is not present to explicate himself better) we are to take the former of his opinions; for that is clearly signified to be his, and directly, whereas the other might proceed from error in the deduction, or ignorance of the repugnancy.
Thomas Hobbes