The moving power of mathematical invention is not reasoning but imagination.

I did not hear what you said, but I absolutely disagree with you.

I was x years old in the year x2.

Wrong hypotheses, rightly worked from, have produced more useful results than unguided observations.

But the gambling reasoner is incorrigible: if he would but take to squaring the circle, what a load of misery would be saved.

Mathematicians care no more for logic than logicians for mathematics.

I don't quite hear what you say, but I beg to differ entirely with you.

It should seem that it is easier to square the circle than to get round a mathematician.

Common integration is only the memory of differentiation.

The sacred writings excepted, no Greek has been so much read and so variously translated as Euclid.

As to writing another book on geometry [to replace Euclid] the middle ages would have as soon thought of composing another New Testament.

Turns out, you can take the girl out of the spy school, but you can never take the spy school out of the girl.

The essence of education is the education of the body.

Where sin has abounded in me, Grace now much more abounds in me. I live by that 'much more.'

And the Raven, never flitting, still is sitting, still is sitting...

It(Boston Bombings) was worth it to hear you(survivor speakers) speak.

After 26 years, I am still practicing what I preach.

Rae Carson's heroine is a perfect blend of the ordinary and the extraordinary. I loved her.

All persecution is a sign of fear; for if we did not fear the power of an opinion different from our own, we should not mind others holding it.

Baseball is a lot like life. The line drives are caught, the squibbles go for base hits. It's an unfair game.

But the reality is that we don't live in Mr. Rogers neighborhood anymore. The reality is that our officers should be armed.