The success of a society depends on its ability to balance the demands of individual freedom with the need for social cohesion.
People of the same trade seldom meet together， even for merriment and diversion， but the conversation ends in a conspiracy against the public， or in some contrivance to raise prices.
You can't change the past, but you can ruin the present by worrying about the future.
"The important thing in science is not so much to obtain new facts as to discover new ways of thinking about them."