Crossword puzzle clue "writer who said one cannot think well love well sleep well if one has not dined well"

Writer who said "One cannot think well, love well, sleep well, if one has not dined well"

Writer who said "What I cannot love, I overlook"

Roosevelt who said "You must do the things you think you cannot do"

"We cannot all be masters, nor all masters / Cannot be truly 'd" speaker

It's said that he said, "I never said most of the things I said"

With this one cannot think

Governor who said "I don't think there's anybody in America who would necessarily think my personality is best suited to being number two"

He said "I never think I have finished a nude until I think I could pinch it"