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Man cannot produce a single work without the assistance of the slow, assiduous, corrosive worm of thought.

The human mind will not be confined to any limits.

We cannot perform our tasks to the best of our power, unless we think well of our own capacity.

I have a mind that never stops working. As a matter of fact, it torments me.

No fine work can be done without concentration and self-sacrifice and toil and doubt.

There are things we can control and the things we can't control. I can't control how people react to the work I do.

I don't say: 'can't do that', 'won't do that'. I've never thought in that way about work.

I would rather not work than be a neurotic mess.

There are no constraints on the human mind, no walls around the human spirit, no barriers to our progress except those we ourselves erect.

We must make working life more human.