Confucius
学而不思则罔，思而不学则殆。
Learning without thought is labour lost ; thought without learning is perilous To study and not think is a waste. To think and not study is dangerous. 思考与学习要一同进行，二者缺一不可。
三人行，必有我师焉。择其善者而从之，其不善者而改之。
Out of a group of three people, one of them will be my teacher. I take after their good points and correct the bad.
If I'm together with some people, than there must be my teachers! I will study their merits, and avoid their shortcomings.
知之为知之，不知为不知，是知也。
wisdom lies in admitting what you know as well as what you don't know。 It is wise to hold what you know and admit what you don't know.
有教无类。
In teaching there should be no distinction of classes.
Make no social distinctions in Teaching
学而时习之，不亦说乎？
Is it not pleasant to learn with a constant perseverance and application? To learn and at due times to repeat what one has learnt, is it not after all a pleasure?
温故而知新，可以为师矣。
If a man keeps cherishing his old knowledge, so as continually to be acquiring new, he may be a teacher of others.
He who learns by reviewing his knowledge is a capable teacher. Learning in review, a master you will be.
知之者，不如好之者，好之者，不如乐之者。They who know the truth are not equal to those who love it, and they who love it are not equal to those who delight in it.
Knowing it is not as good as liking it, and liking it is not as good as enjoying it.
People who know it better than who work on it, who work on it not as good as who love it.