Qui craint de souffrir, il souffre déjà de ce qu'il craint. -La Fontaine

Fear. Of suffering.

Fear. an unpleasant emotion caused by
the belief that someone
or something is dangerous,
likely to cause pain, or a threat

Fear.

I think La Fontaine put it nicely: Qui craint de souffrir, il souffre déjà de ce qu'il craint.
Translation: He who fears suffering is already suffering that which he fears.