Nature has given to men one tongue, but two ears, that we may hear from others twice as much as we speak. Epictetus
God Himself heals the proud. This means that inner sorrows (by which pride is healed) are sent to us by God, for the proud man will not suffer anything from others. But the humble person will endure everything, and will always say, 'I deserve this.' Ambrose of Optina
A nation's strength ultimately consists in what it can do on its own, and not in what it can borrow from others. Indira Gandhi
He who doesn't listen to advise from others goes to his parents in-law smeared with faeces. African Proverb
If we did not flatter ourselves, the flattery from others would not harm us. Traditional Proverb
It takes a wise man to learn from his mistakes, but an even wiser man to learn from others. Zen Proverb