Self-conceit may lead to self destruction.
A doubtful friend is worse than a certain enemy. Let a man be one thing or the other, and we then know how to meet him.
Always stop to think whether your fun may be the cause of another's unhappiness
Outside show is a poor substitute for inner worth.
While I see many hoof marks going in, I see none coming out. It is easier to get into the enemy's toils than out again.
Every truth has two sides; it is as well to look at both, before we commit ourselves to either.