A blemish may be removed from a diamond by careful polishing, but evil words once spoken cannot be effaced.

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.

Don't worry about being acknowledged by others; worry about failing to acknowledge them.

If language is not rectified, words do not correspond to meaning, and if words do not correspond to meaning, our deeds cannot be accomplished.

Being strong does not mean that you never fall down, but that whenever you fall, you get up again.

If you don't know the life yet, how could be possible for you to know the death?

There may be men who act without understanding why. I do not. To listen much, pick out the good and follow it; to see much and ponder it: this comes next to understanding.