Rely only on yourself; it is a common proverb.
It is twice the pleasure to deceive the deceiver.
Nothing is more dangerous than a friend without discretion; even a prudent enemy is preferable.
We like to see others, but don't like others to see through us.
To live lightheartedly but not recklessly; to be gay without being boisterous; to be courageous without being bold; to show trust and cheerful resignation without fatalism - this is the art of living.
What a wonderful thing it is to have a good friend. He identifies your innermost desires, and spares you the embarrassment of disclosing them to him yourself.