为学犹掘井，井愈深土愈难出，若不快心到底，岂得见泉源乎？绔。

Learn nand well made, the deeper soil more difficult, if not quickly heart, would see fountain.

youdao

为学犹掘井，井愈深土愈难出，若不快心到底，岂得见泉源乎？绔。

Learn nand well made, the deeper soil more difficult, if not quickly heart, would see fountain.

youdao