The tongue of the wise commends knowledge, but the mouth of the fool gushes folly. The tongue that brings healing is a tree of life, but a decietful tongue crushes the spirit . . . He sent forth his word and healed them. Proverbs 2:4; Psalm 107:20
There are some animals whose tongue contains an antiseptic; they lick their wounds to bring healing. They are self-reliant; God knew they couldn't go down to the local pharmacy or call a doctor.
People sometimes suffer wounded spirits. No pharmacy perscription or doctor can bring healing. What do those people do? They try to be self-reliant and retreat to lick their wounds. Eventually they discover that they are unable to heal themselves.
The wise words of the Proverbs now come into play. Our words can contain a medicinal value and bring healing to the soul and spirit of another. They are not just any words, but instead, words guided by the wisdom that God alone can provide.
No one is self-reliant -- not the wounded -- not those who have the power to heal. The wounded rely on the words of others. The healers rely on the word of Another -- He sent forth his word and healed them.