"I was in deadly earnest about developing my talent, and carousing had no lure for me. I applied myself assiduously to the work in hand, and as I proceeded I became more and more convinced that graphic art was my road to recognition. Painting interested me no less, but I thought of it as having no influence. If one painted a portrait, or a landscape, or whatever, for a rich man to own in his private gallery, what was the use? On the other hand, a cartoon could be reproduced by simple mechanical processes and easily made accessible to hundreds of thousands. I wanted a large audience."
January 1, 1970
https://en.wikiquote.org/wiki/Editorial_cartoon