If you are wise you won't be deceived by the innocent airs of those whom you have once found to be dangerous.
Adversity tests the sincerity of friends
We should look to the mind, and not to the outward appearance.
Conceit may bring about one's own downfall.
He that always gives way to others will end in having no principles of his own.
You will only injure yourself if you take notice of despicable enemies.