Measure what is measurable, and make measurable what is not so.

It is surely harmful to souls to make it a heresy to believe what is proved.

I give infinite thanks to God, who has been pleased to make me the first observer of marvelous things.

We cannot teach people anything; we can only help them discover it within themselves.

I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use.

Where the senses fail us, reason must step in.