"Did you make a convert of the obstinate antivaxinist at Lello?"

"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 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 most difficult task is often the most rewarding."

"I have often reflected, with a degree of wonder, on the slow progress of human knowledge."