As the sun is best seen at his rising and setting, so men's native dispositions are clearest seen when they are children, and when they are dying.

Nature always looks out for the preservation of the universe.

There is no less invention in aptly applying a thought found in a book, than in being the first author of the thought.

Acid Salts have the Power of Destroying the Blewness of the Infusion of our Wood [lignum nephreticum], and those Liquors indiscriminatly that abound with Sulphurous Salts, (under which I comprehend the Urinous and Volatile Salts of Animal Substances, and the Alcalisate or fixed Salts that are made by Incineration) have the virtue of Restoring it.

In the Bible the ignorant may learn all requisite knowledge, and the most knowing may learn to discern their ignorance.

The generality of men are so accustomed to judge of things by their senses that, because the air is indivisible, they ascribe but little to it, and think it but one remove from nothing.

It is my intent to beget a good understanding between the chymists and the mechanical philosophers who have hitherto been too little acquainted with one another's learning.