There is no limit to which a man will not go to avoid thinking.

He who joyfully marches to music in rank and file has already earned my contempt. He has been given a large brain by mistake, since for him the spinal cord would suffice.

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

Thinking is the capital, Enterprise is the way, Hard Work is the solution

I am neither bitter nor cynical but I do wish there was less immaturity in political thinking.

I believe there exists, & I feel within me, an instinct for the truth, or knowledge or discovery, of something of the same nature as the instinct of virtue, & that our having such an instinct is reason enough for scientific researches without any practical results ever ensuing from them.