English Poet and Essayist Human beings are perhaps never more frightening than when they are convinced beyond doubt that they are right. Life is doubt, and faith without doubt is nothing but death. To have doubted one's own first principles, is the mark of a civilized man. American Author, Wit and Poet Doubt is the key to knowledge. English Dramatist Never do a thing concerning the rectitude of which you are in doubt.
Dangers bring fears, and fears more dangers bring.
English Poet Top of Page It may be doubtful, at first, whether a person is an enemy or friend. But poison, if used rightly, may turn medicinal. Tibetan Grand Lama To have doubted one's own first principles is the mark of a civilized man. Skepticism means not intellectual doubt alone, but moral doubt. The fearful unbelief is unbelief in yourself.