Note, 1. A good heart by the tongue becomes very useful. He that has knowledge is not only to enjoy it, for his own entertainment, but to use it, to use it aright, for the edification of others; and it is the tongue that must make use of it in pious profitable discourse, in giving suitable and seasonable instructions, counsels, and comforts, with all possible expressions of humility and love, and then knowledge is used aright; and to him that has, and thus uses what he has, more shall be given. 2. A wicked heart by the tongue becomes very hurtful; for the mouth of fools belches out foolishness, which is very offensive; and the corrupt communication which proceeds from an evil treasure within (the filthiness, and foolish talking, and jesting) corrupts the good manners of some and debauches them, and grieves the good hearts of others and disturbs them.

The great truths of divinity are of great use to enforce the precepts of morality, and none more than this - That the eye of God is always upon the children of men. 1. An eye to discern all, not only from which nothing can be concealed, but by which every thing is actually inspected, and nothing overlooked or looked slightly upon: The eyes of the Lord are in every place; for he not only sees all from on high (Psa 33:13), but he is every where present. Angels are full of eyes (Rev 4:8), but God is all eye. It denotes not only his omniscience, that he sees all, but his universal providence, that he upholds and governs all. Secret sins, services, and sorrows, are under his eye. 2. An eye to distinguish both persons and actions. He beholds the evil and the good, is displeased with the evil and approves of the good, and will judge men according to the sight of his eyes, Psa 1:6; Psa 11:4. The wicked shall not go unpunished, nor the righteous unrewarded, for God has his eye upon both and knows their true character; this speaks as much comfort to saints as terror to sinners.

Note, 1. A good tongue is healing, healing to wounded consciences by comforting them, to sin-sick souls by convincing them, to peace and love when it is broken by accommodating differences, compromising matters in variance, and reconciling parties at variance; this is the healing of the tongue, which is a tree of life, the leaves of which have a sanative virtue, Rev 22:2. He that knows how to discourse will make the place he lives in a paradise. 2. An evil tongue is wounding (perverseness, passion, falsehood, and filthiness there, are a breach in the spirit); it wounds the conscience of the evil speaker, and occasions either guilt or grief to the hearers, and both are to be reckoned breaches in the spirit. Hard words indeed break no bones, but many a heart has been broken by them.

Hence, 1. Let superiors be admonished to give instruction and reproof to those that are under their charge, as they will answer it in the day of account. They must not only instruct with the light of knowledge, but reprove with the heat of zeal; and both these must be done with the authority and affection of a father, and must be continued, though the desired effect be not immediately perceived. If the instruction be despised, give reproof, and rebuke sharply. It is indeed against the grain with good-humoured men to find fault, and make those about them uneasy; but better so than to suffer them to go on undisturbed in the way to ruin. 2. Let inferiors be admonished, not only to submit to instruction and reproof (even hardships must be submitted to), but to value them as favours and not despise them, to make use of them for their direction, and always to have a regard to them; this will be an evidence that they are wise and a means of making them so; whereas he that slights his good education is a fool and is likely to live and die one.