"The greatest pleasure is to be found in the contemplation of truth."

"I have often wondered and even laughed at those who fancied that everything had been so consummately and absolutely investigated by an Aristotle or a Galen or some other mighty name, that nothing coul…"

"Nature is nowhere accustomed more openly to display her secret mysteries than in cases where she shows tracings of her workings apart from the beaten paths; nor is there any better way to advance the …"

"It is by experiment alone that we can arrive at the knowledge of nature."

"Nature is a free and open book, to be read and understood by all who have the patience and the power to do so."