The greatest minds, as they are capable of the highest excellencies, are open likewise to the greatest aberrations; and those who travel very slowly may yet make far greater progress, provided they keep always to the straight road, than those who, while they run, forsake it.

Here I beg you to observe in passing that the scruples that prevented ancient writers from using arithmetical terms in geometry, and which can only be a consequence of their inability to perceive clearly the relation between these two subjects, introduced much obscurity and confusion into their explanations.

The chief cause of human errors is to be found in the prejudices picked up in childhood.

If ... it is not in my power to arrive at the knowledge of any truth, I may at least do what is in my power, namely, suspend judgement.

It's the familiar love-hate syndrome of seduction: "I don't really care what it is I say, I care only that you like it."

You just keep pushing. You just keep pushing. I made every mistake that could be made. But I just kept pushing.

I am indeed amazed when I consider how weak my mind is and how prone to error.