Quote by Pliny the Elder
"Gratitude is the most exquisite form of courtesy."
More from Pliny the Elder
"The best plan is to profit from the folly of others."
"What nature requires is obtainable, and within easy reach. It is for the luxuries and conceits of life that we laboriously struggle."
"In comparing various authors with one another, he may be said to have read the most who has gotten the most benefit from his reading."
"The only certainty is that nothing is certain."