It is not possible for one to teach others who cannot teach his own family.
The Essence of Knowledge is, having it, to use it.
A gentleman is calm and spacious: the vulgar are always fretting.
Who keeps the old akindle and adds new knowledge is fitted to be a teacher.
Ignorance is the night of the mind, but a night without moon or star.
The man of noble mind seeks to achieve the good in others and not their evil. The little-minded man is the reverse of this.