"Mental health a state of well-being in which the individual realizes his or her own abilities, can cope with the normal stresses of life, can work productively and fruitfully, and is able to make a contribution to his or her community."
Altman E.G., Hedeker D., Peterson JL., Davis J.M. The Altman Self-Rating Mania Scale. Biol Psychiatry. 1997 Nov 15;42(10):948-55.