Don't let yourself feel worthless: often through life you will really be at your worst when you seem to think best of yourself; and don't worry about losing your "personality," as you persist in calling it: at fifteen you had the radiance of early morning, at twenty you will begin to have the melancholy brilliance of the moon, and when you are my age you will give out, as I do, the genial golden warmth of 4 p.m.