Ignorance per se is not nearly as dangerous as ignorance of ignorance.
Great talents are the most lovely and often the most dangerous fruits on the tree of humanity. They hang upon the most slender twigs that are easily snapped off.
You need only reflect that one of the best ways to get yourself a reputation as a dangerous citizen these days is to go about repeating the very phrases which our founding fathers used in the struggle for independence.
I know that every good and excellent thing in the world stands moment by moment on the razor-edge of danger and must be fought for.
Nothing in all the world is more dangerous than sincere ignorance and conscientious stupidity.
Power always has to be kept in check; power exercised in secret, especially under the cloak of national security, is doubly dangerous.
The real threat to whales is whaling, which has endangered many whale species.
I am one who believes that one of the greatest dangers of advertising is not that of misleading people, but that of boring them to death.
In the world of commercial speech, tobacco advertising bears the earmarks of an endangered species.
It is dangerous to be sincere unless you are also stupid.
When written in Chinese, the word 'crisis' is composed of two characters. One represents danger and the other represents opportunity.
The real danger is not that computers will begin to think like men, but that men will begin to think like computers.
When we are afraid we ought not to occupy ourselves with endeavoring to prove that there is no danger, but in strengthening ourselves to go on in spite of the danger.
A timid person is frightened before a danger, a coward during the time, and a courageous person afterward.
We cannot banish dangers, but we can banish fears. We must not demean life by standing in awe of death.
The danger is not that a particular class is unfit to govern: every class is unfit to govern.