“… in what respect does the philosopher, who pursues science in order that he may pass life pleasantly to himself, differ from that drunkard there, who only seeks the immediate gratification that gin affords him? The philosopher has, past all question, chosen his enjoyment more wisely, since it affords him a pleasure far deeper and more lasting than that of the toper. But that is all! Both one and the other have the same selfish end in view, personal gratification.”
(From An Appeal to the Young by Peter Kropotkin)
Bit harsh, but is it true?