If a problem cannot be solved， enlarge it.
如果一个问题无法解决，那就扩大它的范围。
The key to success is to never stop learning.
The personal example of a teacher is the most useful sunshine that nothing can replace for the soul of young people.
不幸福的主要原因从来都不是你身处的状况，而是你对此的想法。
How many roads must a man walk down before you call him a man?
