叶落归根（葉落歸根）　

◎ 叶落归根 yèluò-guīgēn

[what comes from the soil will return to the soil;falling leaves will return to the roots] 比喻不忘本源。多指客居他乡的人最终总要回归故土

叶落归根,来时无口。——唐· 慧能《六祖大师法宝坛经·付属品》