principle of sufficient reason
A philosophical principle stating that everything must have a reason or cause. Used in logic and metaphysics. Also referred to as 充足理由の原理.
See also: 充足理由の原理
ライプニッツは充足理由律を哲学の基本原理の一つとした。
Leibniz made the principle of sufficient reason one of the fundamental principles of his philosophy.