29. Another sin is, a jeering, mocking, deriding, or scorning at others, either for their infirmities of body or mind, or for their virtues, or through envy and malice, or pride, or a custom of deriding, scornful speech. "Scorners delight in scorning," Prov. i. 22. See Psal. xxii. 7; xliv. 13; lxxix. 4. Especially when sinners scorn at the reproofs and counsels of the godly, and cast them all back into their faces with contempt; for he that "reproveth a scorner getteth himself a blot," Prov. ix. 7, 8. "A scorner loveth not one that reproveth," Prov. xv. 12.
30. Another tongue sin is, idolatry or false worship; the praise of idols, or praying to them, or making songs, or speeches, or disputes for them; as also the false worship of the true God. These among others are the sins of the tongue to be avoided. No wonder if there be yet more, for the "tongue is ὁ κοσμος της αδικιας, a world of iniquity," James iii. 6.
_Direct._ IV. When you have thus understood the duties and sins of the tongue, and the greatness of them, the next thing which you must be most careful and diligent about is, that you keep all that upon the heart which should be upon the tongue, and keep the heart clean from that which the tongue must be kept clean from.[485] The principal work must be about the heart; for "out of the abundance of the heart the mouth speaketh." 1. The tongue will be no other way effectually governed; if the heart be upon the world, the tongue will most commonly be upon the world; you may force it a little against your hearts, but it will be to a very unconstant obedience; when you ever so little loose the reins it is gone. If the heart be proud, the tongue will speak proudly; if the heart be lustful, or vain, or malicious, the words will ordinarily be so too. 2. Or if you can force the tongue to go against the heart, it is but a hypocritical reformation. A vain, a proud, a worldly, a wanton, a malicious or ungodly heart will condemn you, though the tongue was forced to speak humbly, chastely, patiently, or piously. Therefore if you would overcome the vanity, or worldliness, or wantonness, or any other corruption of your speech, first set yourselves to overcome the same corruption in your hearts, and to revive and actuate the contrary graces. And if you would use your tongues to the honour of God, and the edification of men, wind up the spring of those holy affections which must be as water to the mill. It is the use of the tongue to express the mind: and it is the use of holy speech to be the expression of a holy mind. And do you think to express that which you have not? Will you make a duty of a lie? If you would speak of Christ or heaven with seriousness, see that your hearts are seriously set upon Christ and heaven. When you go into any company where you should speak for God, and for the hearers' good, endeavour beforehand to get a deep impression on your hearts of those attributes or truths of God which you would express; and to revive the sense of that upon yourselves which you would make others sensible of. Stir up within you the love of God, and the love of holiness and truth, and a love of the souls of them you speak to; and then you will be as a conduit which runs as soon as the cock is turned, because it is always full of water.