I must continue to follow the path I take now. If I do nothing, if I study nothing, if I cease searching, then, woe is me, I am lost. That is how I look at it — keep going, keep going come what may.
But what is your final goal, you may ask. That goal will become clearer, will emerge slowly but surely, much as the rough draught turns into a sketch, and the sketch into a painting through the serious work done on it, through the elaboration of the original vague idea and through the consolidation of the first fleeting and passing thought.

Letter to Theo (July 1880)