"I shall not, I presume, be thought presumptuous in declaring, that the Cow Pox is the most efficacious, and the most safe, of all the methods that have been yet discovered, for eradicating the Small P…"

"The true philosopher is he who is always learning, and who is never ashamed to confess his ignorance."

"The joy I felt at the prospect before me of being the instrument destined to take away from the world one of its greatest calamities was so excessive that I sometimes found myself in a kind of reverie…"

"I have often been surprised at the credulity of mankind; but I have also been surprised at their obstinacy."

"Don't think; try."