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

Integrity without knowledge is weak and useless, and knowledge without integrity is dangerous and dreadful.

He who has so little knowledge of human nature as to seek happiness by changing anything but his own disposition will waste his life in fruitless efforts.

Between falsehood and useless truth there is little difference. As gold which he cannot spend will make no man rich, so knowledge which cannot apply will make no man wise.

Leisure and curiosity might soon make great advances in useful knowledge, were they not diverted by minute emulation and laborious trifles.