The **principle of sufficient reason** states that anything that happens does so for a reason: no state of affairs can obtain, and no statement can be true unless there is sufficient reason why it should not be otherwise.

Formulation

- For every entity
*x*, if*x*exists, then there is a sufficient explanation why*x*exists. - For every event
*e*, if*e*occurs, then there is a sufficient explanation why*e*occurs. - For every proposition
*p*, if*p*is true, then there is a sufficient explanation why*p*is true.

A sufficient explanation may be understood either in terms of *reasons* or *causes* for like many philosophers of the period, Leibniz did not carefully distinguish between the two. The resulting principle is very different, however, depending on which interpretation is given.

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