意思是“好心未必有好报”
eg：You say you will do this.Let me see some evidence.The road to hell is paved with good intentions.
你说你会干这事的,让我看看证据吧,光有良好愿望无补于事.
The record of American diplomacy is paved with good intentions which had unfortunate results.
美国外交记录充满了诸多以不幸收场的善意.