Friends are like money, easier made than kept.

He is greatest who is most often in men's good thoughts.

The extremes of vice and virtue are alike detestable, and absolute virtue is as sure to kill a man as absolute vice is.

Arguments are like fire-arms which a man may keep at home but should not carry about with him.

If [science] tends to thicken the crust of ice on which, as it were, we are skating, it is all right. If it tries to find, or professes to have found, the solid ground at the bottom of the water it is all wrong. Our business is with the thickening of this crust by extending our knowledge downward from above, as ice gets thicker while the frost lasts; we should not try to freeze upwards from the bottom.

Justice is my being allowed to do whatever I like. Injustice is whatever prevents my doing so.

He dons are too busy educating the young men to be able to teach them anything.