"No great discovery was made without a bold guess."
"Plato is my friend, Aristotle is my friend - but my greatest friend is truth."
"I have not been able to discover the cause of those properties of gravity from phenonomena, and I frame no hypothesis."
"I can calculate the motion of heavenly bodies but not the madness of people.”
“What we know is a drop, what we don't know is an ocean.”
“To explain all nature is too difficult a task for any one man or even for any one age. Tis much better to do a little with certainty & leave the rest for others that come after than to explain all things by conjecture without making sure of any thing.”
“Nature is pleased with simplicity. And nature is no dummy.”
"We build too many walls, and not enough bridges."