يعقوب ٣:١١

fountain--an image of the heart: as the aperture (so the Greek for "place" is literally) of the fountain is an image of man's mouth. The image here is appropriate to the scene of the Epistle, Palestine, wherein salt and bitter springs are found. Though "sweet" springs are sometimes found near, yet "sweet and bitter" (water) do not flow "at the same place" (aperture). Grace can make the same mouth that "sent forth the bitter" once, send forth the sweet for the time to come: as the wood (typical of Christ's cross) changed Marah's bitter water into sweet.

The apostle here reproves ambition, and an arrogant magisterial tongue; and shows the duty and advantage of bridling it because of its power to do mischief. Those who profess religion ought especially to govern their tongues (Jam 3:1-12). True wisdom makes men meek, and avoiders of strife and envy: and hereby it may easily be distinguished from a wisdom that is earthly and hypocritical (Jam 3:13 to the end).

3:11 Some springs, especially in the upper sources of the Jordan River, did produce fresh water and bitter water; such brackish springs could not support a town. Similarly, if a person’s speech mixes foul with sweet, it will not build up the community.