I like […] freedom of mathematics. If physical or chemical studies must describe the real world. But in mathematics you can build your structures. You can walk in worlds created […]
John Arbuthnot (1667-1735)
Mathematical knowledge adds vigor to the mind, and freedom from prejudice, superstition and credulity.
Martin Gardner (1914-2010)
Not only mathematics is real, but it is the only reality.
Leonardo da Vinci (1452-1519)
O investigating, studied mathematics, and not built without foundations.