Never tire to study. And to teach to others

How should I know anything about another world when I know so little of this?

Things that are done, it is needless to speak about...things that are past, it is needless to blame.

The demands that a great man makes are on himself; those of a petty man are upon others.

Ask yourself constantly, "What is the right thing to do?" Behave toward everyone as if receiving a great guest.

There are some with whom we may study in common, but we shall find them unable to go along with us to principles. Perhaps we may go on with them to principles, but we shall find them unable to get established in those along with us. Or if we may get so established along with them, we shall find them unable to weigh occurring events along with us.

Never tire to study. And to teach to others