Judge a man by his questions rather than by his answers.
Your worst enemies won't harm you as much your own unguarded thoughts.
Be realistic, demand the impossible.
Whether you think you can, or you think you can't--you're right.
We are what we think. All that we are arises with our thoughts. With our thoughts, we make our world.
Reading, after a certain age, diverts the mind too much from its creative pursuits. Any man who reads too much and uses his own brain too little falls into lazy habits of thinking.
Thinking: the talking of the soul with itself.
Worry is a misuse of imagination.
You can't find stupidity in the forest.
Discovery consists of seeing what everybody has seen, and thinking what nobody has thought.
If everyone is thinking alike, then somebody isn't thinking.
Music stops you from thinking.
The best thinking has been done in solitude. The worst has been done in turmoil.
A great many people think they are thinking when they are merely rearranging their prejudices.
Wisdom is nothing but a preparation of the soul, a capacity, a secret art of thinking, feeling and breathing thoughts of unity at every moment of life.