Don't stumble over something behind you.

As many servants so many enemies.

The greatest loss of time is delay and expectation, which depend upon the future. We let go the present, which we have in our power, and look forward to that which depends upon chance, and so relinquish a certainty for an uncertainty.

We all sorely complain of the shortness of time, and yet have much more than we know what to do with. Our lives are either spent in doing nothing at all, or in doing nothing to the purpose, or in doing nothing that we ought to do. We are always complaining that our days are few, and acting as though there would be no end of them.

One who's our friend is fond of us; one who's fond of us isn't necessarily our friend.

An old man at school is a contemptible and ridiculous object.

That loss is most discreditable which is caused by negligence.