To know what you like is the beginning of wisdom and of old age. Youth is wholly experimental. The essence and charm of that unquiet and delightful epoch is ignorance of self as well as ignorance of life. These two unknowns the young man brings together again and again, now in the airiest touch, now with a bitter hug; now with exquisite pleasure, now with cutting pain; but never with indifference, to which he is a total stranger, and never with that near kinsman of indifference, contentment.