
A Treasury of Inspirational Thoughts (2004) by S.P. Sharma, p. 41.
Disputed
Engraving at Bell Labs as quoted in Comprehending and Decoding the Cosmos: Discovering Solutions to Over a Dozen Cosmic Mysteries by Jerome Drexler (2006). p. viii.
Disputed
A Treasury of Inspirational Thoughts (2004) by S.P. Sharma, p. 41.
Disputed
As quoted in "The Chemistry of Life" by Ralph Whiteside Kerr in Rosicrucian Digest (1947), p. 131.
Disputed
Context: Don't keep forever on the public road. Leave the beaten track behind occasionally and dive into the woods. You will be certain to find something you have never seen before, and something worth thinking about to occupy your mind. All really big discoveries are the result of thought.
Misattributed