There is just one respect in which Luther appears to have been different from other youths of his time, namely, in that he was extraordinarily sensitive and subject to recurrent periods of exaltation and depression of spirit. This oscillation of mood plagued him throughout his life. He testified that it began in his youth and that the depressions had been acute in the six months prior to his entry into the monastery. One cannot dismiss these states as occasioned merely by adolescence, since he was then