Do you know, a horrible thing has happened to me. I have begun to doubt Tennyson. Gerard Manley Hopkins
There are two ways to slide easily through life; to believe everything or to doubt everything. Both ways save us from thinking. Alfred Korzybski
There is a vulgar incredulity, which in historical matters, as well as in those of religion, finds it easier to doubt than to examine. Walter Scott
Just think of the tragedy of teaching children not to doubt. Clarence Darrow
There is no rational reason to doubt that the universe has existed indefinitely, for an infinite time. It is only myth that attempts to say how the universe came to be, either four thousand or twenty billion years ago. Hannes Alfvén
Today the theory of evolution is about as much open to doubt as the theory that the earth goes round the sun. Richard Dawkins