Translation of "se" into English

Pater dixit filio se nullas divitias ei relinquere posse.

The father told his son that he was unable to rid himself of any of his wealth.

Sibi ipsi litteras scripsit.

She wrote a letter to herself.

Sanus est, qui scit quid sit insania, quippe insania scire se non potest, non magis quam caecitas se videre.

But he who knows what insanity is, is sane; whereas insanity can no more be sensible of its own existence, than blindness can see itself.