The man who doesn't make up his mind to cultivate the habit of thinking misses the greatest pleasure in life.

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

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.

There is nothing either good or bad but thinking makes it so.

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