渊源有自来

Explanation: A basis for a source. 　　Source: Song Lu, "read Mr. Wan Ling poem" exhaustive exercise power sources are unsolicited. " 　　Examples: IV to the monarch who, a hundred there calendar years, doctors were giving or receiving of salt to, ~ carry on. ★ Qing Feng, "Shao Buqing <Medical three books> order"