Edward Jenner — "I have always endeavoured to be guided by reason, and not by prejudice."

"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."

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

"The progress of science is slow, but it is sure."

"It is a pity that the practice of inoculation has not been more generally adopted; for if it had, many lives might have been saved."

"I've dispatc'd, my dear madam, this scrap of a letter, To say that Miss — — is very much better. A Regular Doctor no longer she lacks, And therefore I've sent her a couple of Quacks."