dào zhī suǒ cún , shī zhī suǒ cún
If sb has grasped the truth before you, take him as your teacher (Tang dynasty essayist Han Yu 韓愈|韩愈[Han2 Yu4]).
We should learn from one who knows the way.
道
dào
road; path (CL:條|条[tiao2],股[gu3])
之
zhī
(possessive particle, literary equivalent of 的[de5])
所
suǒ
actually
存
cún
to exist
,
,
师
shī
teacher