"A strong body makes the mind strong. As to the species of exercises, I advise the gun. While this gives moderate exercise to the body, it gives boldness, enterprise and independence to the mind. Games played with the ball, and others of that nature, are too violent for the body and stamp no character on the mind. Let your gun therefore be your constant companion of your walks."
Hint- late 18th century.
The next two are from one person:
"The surest way to corrupt a youth is to instruct him to hold in higher esteem those who think alike than those who think differently."
"Insanity in individuals is something rare - but in groups, parties, nations and epochs, it is the rule."