I have hardly ever known a mathematician who was capable of reasoning
Mathematics possesses not only truth, but also supreme beauty
Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true
The true spirit of delight, the exaltation, the sense of being more than Man, which is the touchstone of the highest excellence, is to be found in mathematics as surely as poetry
Politics is for the present, but an equation is for eternity
Pure mathematics is, in its way, the poetry of logical ideas
Do not worry about your difficulties in Mathematics. I can assure you mine are still greater
[Mathematics] is an independent world Created out of pure intelligence.
The science of calculation also is indispensable as far as the extraction of the square and cube roots: Algebra as far as the quadratic equation and the use of logarithms are often of value in ordinary cases: but all beyond these is but a luxury; a delicious luxury indeed; but not be in indulged in by one who is to have a profession to follow for his subsistence.


On Anger: "For every minute you remain angry, you give up sixty seconds of peace of mind."
On Destiny: "Our destiny exercises its influence over us even when, as yet, we have not learned its nature: it is our future that lays down the law of our today."
Human, All Too Human
On Friendship: "A crowd is not company; and faces are but a gallery of pictures; and talk but a tinkling cymbal, where there is no love."