Who can think wise or stupid things at all that were not thought already in the past.

The phrases that men hear or repeat continually, end by becoming convictions and ossify the organs of intelligence.

Girls we love for what they are; young men for what they promise to be.

Mathematics has the completely false reputation of yielding infallible conclusions. Its infallibility is nothing but identity. Two times two is not four, but it is just two times two, and that is what we call four for short. But four is nothing new at all. And thus it goes on and on in its conclusions, except that in the higher formulas the identity fades out of sight.

The world runs on from one folly to another; and the man who, solely from regard to the opinion of others, and without any wish or necessity of his own, toils after gold, honour, or any other phantom, is no better than a fool.

Who is sure of their own motives can in confidence advance or retreat.

As to the value of conversions, God alone can judge. God alone can know how wide are the steps which the soul has to take before it can approach to a community with Him, to the dwelling of the perfect, or to the intercourse and friendship of higher natures.