John Gills Exposition of the Bible Commentary - Proverbs 27:2
Let another man praise thee, and not thine own mouth ,.... Men should do those things which are praiseworthy; and should do them openly, that they may be seen and praised for them: for it is honourable to have such a character as Demetrius had, who had a good report of all men; and as the brother had, whose praise in the Gospel was in all the churches. To be commended by others, by any but a man's self, is to his credit and reputation; but nothing more hurtful to it than self-commendation;... read more
Matthew Henry's Complete Commentary - Proverbs 27:2
Note, 1. We must do that which is commendable, for which even strangers may praise us. Our light must shine before men, and we must do good works that may be seen, though we must not do them on purpose that they may be seen. Let our own works be such as will praise us, even in the gates, Phil. 4:8. 2. When we have done it we must not commend ourselves, for that is an evidence of pride, folly, and self-love, and a great lessening to a man's reputation. Every one will be forward to run him down... read more