Who can attain to anything great if he does not feel in himself the force and will to inflict great pain? The ability to suffer is a small matter: in that line, weak women and even slaves often attain masterliness. But not to perish from internal distress and doubt when one inflicts great suffering and hears the cry of it — that is great, that belongs to greatness.

Sec. 325. - The Gay Science (1882)