William Harvey...on the quest for knowledge

True philosophers, who are only eager for truth and knowledge, never regard themselves as already so thoroughly informed, but that they welcome further information from whomsoever and wheresoever it may come; nor are they so narrow minded as to imagine any of the arts or sciences transmitted to us by the ancients in such a state of forwardness or completeness that notheing is left for the ingenuity and industry of others. On the contrary, very many maintain that all we know is still infinitely less than all that still remains unknown.

-Letter to the Royal College of Physicians, 1628