The direct returns -- the wages of the trade -- are small, but the indirect -- the wages of the life -- are incalculably great. No other business offers a man his daily bread upon such joyful terms. The soldier and the explorer have moments of a worthier excitement, but they are purchased by cruel hardships and periods of tedium that beggar language. In the life of the artist there need be no hour without its pleasure. I take the author, with whose career I am best acquainted; and it is true he works in a rebellious material, and that the act of writing is cramped and trying both to the eyes and the temper; but remark him in his study, when matter crowds upon him and words are not wanting -- in what a continual series of small successes time flows by; with what a sense of power as of one moving mountains, he marshals his petty characters; with what pleasures, both of the ear and eye, he sees his airy structure growing on the page; and how he labours in a craft to which the whole material of his life is tributary, and which opens a door to all his tastes, his loves, his hatreds, and his convictions, so that what he writes is only what he longed to utter. He may have enjoyed many things in this big, tragic playground of the world; but what shall he have enjoyed more fully than a morning of successful work?
From "Letter to a Young Gentleman Who Proposes to Embrace a Career of Art" in Essays on the Art of Writing (my latest happy secondhand bookshop find).