yong4 ren2 bu4 yi2, yi2 ren2 bu4 yong4
Analogy: Don't suspect your employee. If you suspect him/her, don't
hire him/her in the first place.
Explanation: If you enlist the help of someone, trust him/her that
he/she will do a good job. If you don't trust him/her, do the job
yourself.
