Every mind has a horizon in respect to its present intellectual capacity but not in respect to its future intellectual capacity.

It is unworthy of excellent men to lose hours like slaves in the labor of calculation which could be relegated to anyone else if machines were used.

Either there are no corporeal substances, and bodies are merely phenomena which are true or consistent with each other, such as a rainbow or a perfectly coherent dream, or there is in all corporeal substances something analogous to the soul.

Indeed in general I hold that there is nothing truer than happiness, and nothing happier and sweeter than truth.

Imaginary numbers are a fine and wonderful refuge of the divine spirit almost an amphibian between being and non-being.

I am so in favor of the actual infinite that instead of admitting that Nature abhors it, as is commonly said, I hold that Nature makes frequent use of it everywhere, in order to show more effectively the perfections of its Author.

Of what use would it be to you, sir, to become King of China on condition that you forgot what you have been? Would it not be the same as if God, at the same time he destroyed you, created a King in China?