The basic idea that the purpose of life is to be happy or is to experience the most favorable ratio of pleasure to suffering or productivity to work or gratification to sacrifice or any of that stuff, which, you know, a couple generations ago, to say that kind of stuff would have made you, you know, a freak - a freak and an Epicurean - and now seems to be so much - simply an unquestioned assumption of the culture that we don't really even talk about it anymore.
Enthusiasm is the inspiration of everything great. Without it no man is to be feared, and with it none despised.