Just as it's folly to try to lift yourself into the air, you should not praise yourself too much. When you praise yourself, you produce the opposite effect in others, and appear lower in their eyes.
If you want other people to speak well of you, do not speak well of yourself.
— Blaise Pascal
A man who praises himself does not see anything except himself around him. It is better to be a blind man than to see only yourself and nobody else.
— Muslih-Ud-Din Saadi
He who always listens to what other people say about him will never find inner peace.
A flatterer speaks his flattery because he has a low opinion of himself and of others.
— Jean De La Bruyere
If you want to preserve your good name, do not praise yourself and do not so much as allow others to praise you.