I think it does...if the person is able to find a meaning out of the suffering.
I believe it does, depends on how you handle it all.
It depends upon the cause of suffering
it migth give us more emotional intelligence which might connect with acadmic intelligence. When we have bene trhough something we might see things in amore spiritual way, we see the bigger picture. When we havnt our ego might be more there and cloud our abillity to see.
Not always. It can have the opposite effect, and make people into brutes.