1. Diligence leads to excellence in work, and playfulness leads to waste. ——Han Yu

2. You should study at any time and learn everything; you should concentrate your efforts to know more and know everything. ——Al Gore

3. Knowledge is the sweet fruit that grows from the bitter root. ——Ricardo

4. If you want to know the affairs of the world, you must read the books of the ancients.

——Feng Menglong