良莠不齐（良莠不齊）　

◎ 良莠不齐 liángyǒu-bùqí

[grain or chaff;the good and the bad are intermingled; sheep and goats; there are bad as well as good people in the group; there are weeds among seedlings; thread and thrum] 莠:狗尾草,比喻品质坏的人。比喻好人坏人混在一起

无如众生愚贤不等,也就如五谷良莠不齐。——清· 文康《儿女英雄传》