It’s always like that. Art is like beginning a sentence before you know its ending. The risks are obvious: you may never get to the end of the sentence at all — or having gotten there, you may not have said anything. This is probably not a good idea in public speaking, but it’s an excellent idea in making art.
In marking art you need to give yourself room to respond authentically, both to your subject matter and to your materials. Arts happens between you and something — a subject, an idea, a technique — and both you and that something need to be free to move.
— ART AND FEAR: OBSERVATIONS ON THE PERILS (AND REWARDS) OF ARTMAKING, by David Bayles and Ted Orland