The essence of mathematics lies in its freedom.
If you do what you’ve always done, you’ll get what you’ve always gotten.
世界是事实的总体，而不是事物的总体。
The greatest danger to American agriculture is the loss of the family farm.
科学不仅仅是事实的集合，而是一种思维方式。
He who is not contented with what he has，would not be contented with what he would like to have.
解释：百姓参加了劳动就会因劳累而去思考如何节俭律己，若经常思考这些问题，就会使自己的心地善良起来；无所事事就会放肆起来，一旦放肆，就会忘掉善良，没有善良就会滋生作恶之心。
Customer loyalty is earned, not bought.