in Thoreau’s Journal:

All enterprises must be self-supporting, must pay for themselves. The great art of life is how to turn the surplus life of the soul into life for the body — that so the life not be a failure. For instance, a poet must sustain his body with his poetry. As is said of the merchants, in ninety-nine cases out of a hundred the life of men is a failure, and bankruptcy may be surely prophesied.

You must get your living by loving.