Nothing is so perfectly amusing as a total change of ideas.
Great ideas originate in the muscles.
The policy of repression of ideas cannot work and never has worked.
Be not astonished at new ideas for it is well known to you that a thing does not therefore cease to be true because it is not accepted by many.
The men who come on the stage at one period are all found to be related to each other. Certain ideas are in the air.
Almost all really new ideas have a certain aspect of foolishness when they are first produced.
Never, never rest contented with any circle of ideas, but always be certain that a wider one is still possible.
Ideas are like wandering sons. They show up when you least expect them.
The teacher is one who makes two ideas grow where only one grew before.
If I have a thousand ideas and only one turns out to be good, I am satisfied.
To die for an idea it is unquestionably noble. But how much nobler it would be if men died for ideas that were true
Congealed thinking is the forerunner of failure... make sure you are always receptive to new ideas.
I will ignore all ideas for new works on engines of war, the invention of which has reached its limits and for whose improvements I see no further hope.
Words are often seen hunting for an idea, but ideas are never seen hunting for words.
The link between ideas and action is rarely direct. There is almost always an intermediate step in which the idea is overcome. De Tocqueville points out that it is at times when passions start to govern human affairs that ideas are most obviously translat
The way to combat noxious ideas is with other ideas. The way to combat falsehoods is with truth.
If you have an apple and I have an apple and we exchange 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.
We are prisoners of ideas.
Ideas are not responsible for their followers!
In a war of ideas, it is people who get killed.
You have to let people challenge your ideas.
The greatest ideas are the simplest.
The best ideas are common property.
The best way to have a good idea is to have a lot of ideas.
When ideas fail, words come in very handy.