If you have an apple and I have an apple and we exchange these apples then you and I will still each have one apple. But if you have an idea and I have an idea and we exchange these ideas, then each of us will have two ideas.

I have never had so many good ideas day after day as when I worked in the garden.

The best way to have a good idea is to have lots of ideas.

Great ideas often receive violent opposition from mediocre minds.

Ideas are great arrows, but there has to be a bow. And politics is the bow of idealism.

Indeed, to some extent it has always been necessary and proper for man, in his thinking, to divide things up, if we tried to deal with the whole of reality at once, we would be swamped. However when this mode of thought is applied more broadly to man's notion of himself and the whole world in which he lives, (i.e. in his world-view) then man ceases to regard the resultant divisions as merely useful or convenient and begins to see and experience himself and this world as actually constituted of separately existing fragments. What is needed is a relativistic theory, to give up altogether the notion that the world is constituted of basic objects or building blocks. Rather one has to view the world in terms of universal flux of events and processes.

The only force that can overcome an idea and a faith is another and better idea and faith, positively and fearlessly upheld.

Just once in a while let us exalt the importance of ideas and information.

If I were required to guess off-hand, and without collusion with higher minds, what is the bottom cause of the amazing material and intellectual advancement of the last fifty years, I should guess that it was the modern-born and previously non-existent disposition on the part of men to believe that a new idea can have value.

Put the argument into a concrete shape, into an image, some hard phrase, round and solid as a ball, which they can see and handle and carry home with them, and the cause is half won.

A man is not idle because he is absorbed in thought. There is a visible labor and there is an invisible labor.