The world is not dangerous because of those who do harm but because of those who look at it without doing anything. Albert Einstein
An idea that is not dangerous is unworthy of being called an idea at all. Oscar Wilde
An idea that is not dangerous is unworthy to be called an idea at all. Elbert Hubbard
Oh, we can populate the dark with horrors, even we who think ourselves informed and sure, believing nothing we cannot measure or weigh. I know beyond all doubt that the dark things crowding in on me either did not exist or were not dangerous to me, and still I was afraid. John Steinbeck
There is no person who is not dangerous for some one. Marie de Rabutin-Chantal, marquise de Sévigné
A little knowledge is said to be a dangerous thing, but it is not dangerous to the imagination. Knowledge is to the imagination what fuel is to flame. A little feeds it; a great deal extinguishes it. Alfred Austin