I cannot believe that the purpose of life is to be "Happy". I think the purpose of life is to be useful, to be responsible, to be compassionate. It is, above all, to matter: to count, to stand for something, to have made some difference that you have lived at all.
In the dark colony of night, when I consider man's magnificent capacity for malice, madness, folly, envy, rage, and destructiveness, and I wonder whether we shall not end up as breakfast for newts and polyps, I seem to hear the muffled cries of all the words in all the books with covers closed.
The purpose of life is to matter, to be productive, to have it make some difference that you lived at all. Happiness, in the ancient, noble sense, means self-fulfillment-and is given to those who use to the fullest whatever talents God or luck or fate bestowed upon them.