A crank is someone with a new idea — until it catches on.
A good idea plus capable men cannot fail; it is better than money in the bank.
A great idea is usually original to more than one discoverer. Great ideas come when the world needs them. Great ideas surround the world's ignorance and press for admission.
A man is not necessarily intelligent because he has plenty of ideas, any more than he is a good general because he has plenty of soldiers.
A mind once stretched by a new idea never regains its original dimensions.
A new and valid idea is worth more than a regiment and fewer men can furnish the former than command the latter.
A new idea is first condemned as ridiculous and then dismissed as trivial, until finally, it becomes what everybody knows.
A new idea is like a child. It's easier to conceive than to deliver.
A pile of rocks ceases to be a rock when somebody contemplates it with the idea of a cathedral in mind.
A powerful idea communicates some of its strength to him who challenges it.
A single idea, if it is right, saves us the labor of an infinity of experiences.
All achievements, all earned riches, have their beginning in an idea.
An idea discovered is much better possessed.
An idea is a feat of association, and the height of it is a good metaphor.
An idea is a point of departure and no more. As soon as you elaborate it, it becomes transformed by thought.
An idea is a putting truth in check-mate.
An idea is never given to you without you being given the power to make it reality. You must, nevertheless, suffer for it.
An idea is not responsible for the people who believe in it.
An idea is the only level which moves the world.
An idea is worth nothing if it has no champion.