Quote: George Bernard Shaw

The true artist will let his wife starve, his children go barefoot, his mother drudge for his living at seventy, sooner than work at anything but his art.

And:

The reasonable man adapts himself to the world. The unreasonable one persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man.

— quoted in Kill Your Darlings by Terence Blacker

Additional:
George Bernard Shaw wikipedia