1 ;;Quote: infinite things can be compounded out of the combination of a few; e.g., numbers from digits

2 ;;Quote: the binary system may be used in place of the decimal system; express all numbers by unity and by nothing

2+;;Note: Harriot, d. 1621, used the binary system many years before Leibnitz

7 ;;Quote: a primitive concept is its own sign; is part of the thing which is conceived through itself, that is, God

7+;;Quote: since derivative concepts arise from primitive ones, nothing exists in things except through the influence of God

7 ;;Quote: a proposition is true a priori when it is reducible to identical propositions; its reason always appears

15 ;;Quote: the highest criterion for abstraction is that it should be an identity or reducible to identities

15+;;Quote: the primary criterion for observed or experienced fact is our perceptions

15+;;Quote: facts are supported by the great weight of authority and of public testimony; it is not credible that many should conspire to deceive

49 ;;Quote: every one is agreed that God has ordered from all eternity the whole succession of the universe; the contrary would destroy the perfection of God

53 ;;Quote: every individual substance contains traces of all of its history and marks of all of its future

65 ;;Quote: everything happens in each substance in consequence of the first state which God gave to it in creating it

75 ;;Quote: necessary truths and contingent truths differ as rationals differ from irrationals; the former reduces to identity while the later leads to infinite regress

75+;;Quote: the certitude and perfect reason of contingent truths is known only to God, who grasps the infinite with one intuition

82 ;;Quote: there are no atoms; in every particle there is a world of innumerable creatures

82+;;Quote: all bodies act on all bodies and are acted on by all

88 ;;Quote: in nature, individuals must differ; there must be a reason why they are diverse; two perfectly similar eggs or blades of grass, will never be found

94 ;;Quote: nothing happens for which a reason cannot be given why it should happen as it does rather than otherwise

111 ;;Quote: those propositions are necessary whose contrary implies a contradiction

111+;;Quote: free and contingent things furnish an infinite series of reasons, which God alone can see through; e.g., of space and time

116 ;;Quote: it is improbable that the lower animals are mere machines; such opinions are against the order of things

181 ;;Quote: perception is a simple substance that cannot be explained mechanically. Imagine entering a thinking machine. Many parts impinge on one another but none are the perceptions

181 ;;Quote: a simple substance or perception is a monad, i.e., a self-sufficient, self-moved, incorporeal entity

189 ;;Quote: an artificial automaton made by the art of man is not a machine in each of its parts; e.g., the tooth of a metal gear

189+;;Quote: the machines of nature, i.e., living bodies, are still machines in the least of their parts ad infinitum