lose one's reason

I can understand how one might lose one's reason for that girl's sake, and not recover it after her death.

And at such a moment not only doubt might come over one but one might lose one's reason from fear, so that one would not be able to think at all.

Is it a crime to lose one's reason?

Ah, how easy it is to lose one's reason!

Ah, how easy it is to lose one's reason!