Edward Jenner — "My greatest ambition has always been to be useful to mankind."

"You see by the papers how I'm annoyed by a set of blockheads who write about the imperfection of the cowpox, as a vaccine, without any knowledge scarcely of its phenomena."

"I have always been a lover of nature, and I have always found great pleasure in studying her works."

"The greatest happiness consists in doing good to others."

"I have often been accused of being too sanguine in my expectations; but time will show whether I am right or wrong."

"The deviation of the Cow Pox from its true character appears to be very frequent; and when it does appear, it is, as far as I have seen, uniformly in the following manner: The vesicle, instead of bein…"