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= Principle of Sufficient Reason
Provisionally, PSR is the view that any contingent ('contingent upon..' == dependent) truth has a sufficient reason.

The reason why we assume this is true is because if something is contingent upon something else, then there must be a reason for it's outcome -- i.e. at least, the very thing it is contingent upon.

An example was given,
* Cats are mammals.
* Cats are reptiles.
* Cats have claws. 

The first statement is a necessary truth because denying it (ex. as with the second statement) results in a contradiction. Cats are, by definition, mammals, so saying that they are reptiles is a contradiction.

The third statement is a contingent truth because it is possible that cats could have evolved without claws.

This is similar to the distinction between essential and accidental qualities. Being a mammal is part of a cat's essence, but having claws is an accident. (Note: This is a terrible argument because being a cat does in fact entail having claws. A better example would be perhaps snakes which are or are not poisonous).