Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information upon it."

"The supreme end of education is expert discernment of all things- the power to tell the good from the bad, the genuine from the counterfeit, and to prefer the good and the genuine to the bad and the counterfeit."

"Sorrow is a kind of rust of the soul, which every new idea contributes in its passage to scour away."

"Such is the state of life, that none are happy but by the anticipation of change: the change itself is nothing; when we have made it, the next wish is to change again."

Nothing at all will be attempted if all possible objections must first be overcome.