The rainbow is such a remarkable phenomenon of nature, and its cause has been so meticulously sought after by inquiring minds throughout the ages, that I could not choose a more appropriate subject for demonstrating how, with the method I am using, we can arrive at knowledge not possessed at all by those whose writings are available to us.

Common sense is the most fairly distributed thing in the world, for each one thinks he is so well-endowed with it that even those who are hardest to satisfy in all other matters are not in the habit of desiring more of it than they already have.

Illusory joy is often worth more than genuine sorrow.

Give me extension and motion and I will construct the universe.

Neither divine grace nor natural knowledge ever diminishes freedom.

But possibly I am something more than I suppose myself to be.

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