Therefore only through education does one come to be dissatisfied with his own knowledge, and only through teaching others does one come to realize the uncomfortable inadequacy of his knowledge. Being dissatisfied with his own knowledge, one then realizes that the trouble lies with himself, and realizing the uncomfortable inadequacy of his knowledger.
The Master said, “A true gentleman is one who has set his heart upon the Way. A fellow who is ashamed merely of shabby clothing or modest meals is not even worth conversing with.” (Analects 4.9)
If I were travelling with two partners, one virtuous and one dishonest, both would be useful as teachers. I would perceive what's good of the first one and I would imitate him whereas I would try to correct in me the defects I may see in the second one.