who is a strong person?

The other day i was talking to my friend about who is an emotionally strong person...the one who shows his emotons or the one who hides them...and he said a strong person is one who can show the emotions that must b shown and can manage his emotions well...i always observed that ppl frowned upon crying as a sign of weakness..but it helps sometimes to let ur emotions out and not keep them bottled up inside u..