From Studies in Prose and Verse (1908) by Arthur Symons.

A man who goes through a day without some fine emotion has wasted his day, whatever he has gained by it. And it is so easy to go through day after day, busily and agreeably, without ever really living for a single instant. Art begins when a man wishes to immortalise the most vivid moment he has ever lived. Life has already, to one not an artist, become art in that moment. And the making of one’s life into art is after all the first duty and privilege of every man. It is to escape from material reality into whatever form of ecstasy is our own form of spiritual existence.