I thought I'd share my quote with you here too.
My top motto for any creative person is: BETTER OUT THAN IN
It's one from my granny that I heard via my uncle, and I like it a lot. I use it to spur myself on when I'm not sure about the thing I'm making or drawing. To make me keep on creating in spite of doubt.
And I also use it when I've done a particularly violent trump. Super handy!