使心用心，反害自身shǐ xīn yòng xīn , fǎn hài zì shēn

only injure oneself in the end for all one’s tricks
❍ 使心用心，反害了自身！ 落后县里老爷要打他庄户，一般也慌了，腆着脸，拿帖子去说，惹的县主不喜欢。(《儒林外史》53) But Mr Zhang,for all his tricks,only injured himself in the end;because when the magistrate wanted to beat his tenants,he lost his head and went,shame-faced,with his visiting card to beg them off.The magistrate was not at all pleased.