PRINCIPLE OF SUFFICIENT REASON

[L:57] The principle of sufficient reason is one of Kant's formal criteria of logic (the others are the principle of contradiction and principle of excluded middle); it determines "the logical actuality of a cognition". It is the principle that a cognition "be logically grounded, that is, have (a) reasons, and (b) no false consequences." Kant adds, "if all consequences of a cognition are true, the cognition is also true".