If I give a student one-fourth of what he should know, I expect him to get the other three-fourths himself, otherwise I do not want him as a student.

If one learns from others, but does not think, one will be bewildered. If, on the other hand, one thinks but does not learn from others, one will be in peril.

Not to alter one's faults is to be faulty indeed.

Never contract friendship with a man that is not better than thyself.

I will not be concerned at other men's not knowing me;I will be concerned at my own want of ability.

Excess and deficiency are equally at fault.

To be wealthy and honored in an unjust society is a disgrace.