John Gills Exposition of the Bible Commentary - Proverbs 10:11
The mouth of a righteous man is a well of life ,.... Like a fountain of living water, continually running and flowing with water, wholesome, reviving, and refreshing; so the righteous man's mouth, out of the abundance of his heart, overflows with good things, which minister grace to the hearers, and are for the use of edifying; things that are pleasant and profitable, grateful and acceptable, comforting, refreshing, and pleasing, and which tend to the good of the life that now is, and that... read more
Matthew Henry's Complete Commentary - Proverbs 10:11
See here, 1. How industrious a good man is, by communicating his goodness, to do good with it: His mouth, the outlet of his mind, is a well of life; it is a constant spring, whence issues good discourse for the edification of others, like streams that water the ground and make it fruitful, and for their consolation, like streams that quench the thirst of the weary traveller. It is like a well of life, that is pure and clean, not only not poisoned, but not muddled, with any corrupt... read more