The one criterion, whether of good or of truth, is the feeling of the moment for the man who feels it; all question of causes of feelings is delusive. We can say with truth and certainty, I have the sensation of white or the sensation of sweet. But that there is a white or a sweet thing which is the cause of the sensation, that we cannot say for certain. A man may very well have the sensation white or sweet from something which has no such quality, as men in delusion or madness have impressions that are true and real inasmuch as they have them, although other people do not admit their reality. There is, therefore, no criterion of truth as between man and man; we may employ the same words, but each has his own impressions and his own individual experiences. One can easily understand this as the doctrine of such a man as Aristippus, the easy-going man of the world, the courtier and the wit, the favourite of the tyrant Dionysius; it fits in well enough with a life of genial self-indulgence; it always reappears whenever a man has reconciled himself 'to roll with pleasure in a sensual sty.' But life is not always, nor for most persons at any time, a thing of ease and soft enchantments, and the Cyrenaic philosophy must remain for the general work-a-day world a stale exotic. 'Every man for himself and the devil take the hindmost,' is a maxim which comes as a rule {128} only to the lips of the worldly successful, while they think themselves strong enough to stand alone. But this solitude of selfishness neither works nor lasts; every man at some time becomes 'the hindmost,' if not before, at least in the hour of death for him or his; at that hour he is hardly disposed, for himself or those he loves, to repeat his maxim.