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

"The human mind is capable of great things; but it is also capable of great errors."

"It is not, that I am an enemy to the practice of inoculation; on the contrary, I am a warm friend to it, and have been so for many years. But I am convinced, that the present mode of conducting it is …"

"It is a fact well known to many, that persons who have had the Cow Pox, are for ever after secure from the infection of the Small Pox."

"The cow-pox protects the human constitution from the infection of smallpox."