Whether a sinner ought to reprove a wrongdoer?

Objections

Objection 1 : It would seem that a sinner ought to reprove a wrongdoer. For no man is excused from obeying a precept by having committed a sin. But fraternal correction is a matter of precept, as stated above (Article [2]). Therefore it seems that a man ought not to forbear from such like correction for the reason that he has committed a sin.
Objection 2 : Further, spiritual almsdeeds are of more account than corporal almsdeeds. Now one who is in sin ought not to abstain from administering corporal alms. Much less therefore ought he, on account of a previous sin, to refrain from correcting wrongdoers.
Objection 3 : Further, it is written (1 Jn. 1:8): "If we say that we have no sin, we deceive ourselves." Therefore if, on account of a sin, a man is hindered from reproving his brother, there will be none to reprove the wrongdoer. But the latter proposition is unreasonable: therefore the former is also.