Principle of Sufficient Reason/Historical Note

Historical Note on Principle of Sufficient Reason
The Principle of Sufficient Reason was the main philosophical starting point of.

He made this statement in article $32$ of his $1714$ work :


 * [N]o fact can be real or existent, no statement true, unless there be a sufficient reason why it is so and not otherwise, although usually these reasons cannot be known to us.