We have overcome the notion that mathematical truths have an existence independent and apart from our own minds. It is even strange to us that such a notion could ever have existed.

The discovery in 1846 of the planet Neptune was a dramatic and spectacular achievement of mathematical astronomy. The very existence of this new member of the solar system, and its exact location, were demonstrated with pencil and paper; there was left to observers only the routine task of pointing their telescopes at the spot the mathematicians had marked.

It makes me very sad none of that is still in existence. But things are much better now. To the top we have not reached, but we're climbing.

A Sceptick therefore, who because he finds that Truths are not universally received, doubts of their existence, is just as foolish as a man who should try large shoes upon little feet, and little shoes upon large feet, and finding that they did not f

Medicine, the only profession that labors incessantly to destroy the reason for its existence

The unrest which keeps the never-stopping clock metaphysics going is the thought that the non-existence of this world is just as possible as its existence.