“The wise man draws more advantage from his enemies than the fool from his friends.”
“A wise man gets more use from his enemies than a fool from his friends.”
“A wise man can learn more from a foolish question than a fool can learn from a wise answer.”
“Only a fool learns from his own mistakes. The wise man learns from the mistakes of others.”
“Even a wise man knows doubt from time to time, it is the fool who allows it to rule his judgement.”
“The wise man understands his weakness and seeks to find a lesson from it. The fool lets it control and destroy him.”