All great ideas are dangerous.

All great ideas are dangerous.

Certainly, travel is more than the seeing of sights; it is a change that goes on, deep and permanent, in read more

Certainly, travel is more than the seeing of sights; it is a change that goes on, deep and permanent, in the ideas of living.

When ideas fail, words come in very handy.

When ideas fail, words come in very handy.

Nothing is more dangerous than an idea, when a man has only one
idea.

Nothing is more dangerous than an idea, when a man has only one
idea.

I can't understand why people are frightened of new ideas. I'm frightened of the old ones.

I can't understand why people are frightened of new ideas. I'm frightened of the old ones.

Good ideas are common - what's uncommon are people who'll work hard enough to bring them about

Good ideas are common - what's uncommon are people who'll work hard enough to bring them about

It is not once nor twice but times without number that the same
ideas make their appearance in the read more

It is not once nor twice but times without number that the same
ideas make their appearance in the world.

The most powerful factors in the world are clear ideas in the minds of energetic men of good will.

The most powerful factors in the world are clear ideas in the minds of energetic men of good will.

We often refuse to accept an idea merely because the tone of voice in which it has been expressed is read more

We often refuse to accept an idea merely because the tone of voice in which it has been expressed is unsympathetic to us.