Wisdom is better than gold or silver.知识胜过金银，

 

Wisdom in the mind is better than money in the hand.胸中有知识，胜于手中有钱。

 

Wisdom is a good purchase though we pay dear for it.为了求知识，代价虽高也值得。

 

Doubt is the key of knowledge.怀疑是知识之钥。