That's been one of my mantras - focus and simplicity. Simple can be harder than complex: You have to work hard to get your thinking clean to make it simple. But it's worth it in the end because once you get there, you can move mountains.

Hard knocks have a place and value, but hard thinking goes farther in less time.

Thinking isn't agreeing or disagreeing. That's voting.

Any man who reads too much and uses his own brain too little falls into lazy habits of thinking.

The whole of science is nothing more than a refinement of everyday thinking.

The world as we have created it is a process of our thinking. It cannot be changed without changing our thinking.