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I. THE NATURE OF A SURE OR CLEAR CONSCIENCE ought to be first stated lest we should mistake shadow for substance, presumption and vain confidence for truth and soberness. The apostle points out the general nature of a good conscience by this mark, that our hearts condemn us not, and that we know that we are of the truth; know it by some certain rule, namely, that we keep God's commandments. And if our conduct be found, upon a just examination, to square with that rule, then our consciences are clear, and we may look up with a becoming confidence to God. This is a matter of great weight, and yet there is nowhere more room for self-flattery and self-deceit. A man will often call it acting according to his conscience, when he acts according to his present persuasion, without ever examining how he came by that persuasion; whether through wrong education, custom, or example; or whether from some secret lust, pride, or prejudice, rather than from the rule of God's written Word, or from a principle of right reason. This cannot be justly called keeping a good conscience: for we ought not to take up false persuasions at all adventures, and then to make those persuasions our rule of life, instead of that rule which God hath given us to walk by. It is deceiving ourselves to imagine that we have a good conscience when we have used no reasonable care in examining whether it be a right conscience or not. There is another common method of self-deceit, when a person who well enough understands the rule he is to go by, yet forgets to apply it to his own particular case, and so speaks peace to himself all the while that he transgresses it. No doubt but a considerate man may know when he behaves as he ought to do, and may reap the comfort of it. And though we are none of us without sin yet a good life is easily distinguished from the life of the ungodly, and a state of grace from a state of sin. And so there is room enough left for the joy of a good conscience, where men live as becometh the gospel of Christ, perfecting holiness, to such a degree as man can be perfect, in the fear of God.

II. I now proceed to discourse of the COMFORTS OF IT. If our hearts condemn us not, then have we confidence towards God; and whatsoever we ask we receive of Him. What greater comfort can there be than conscious virtue drawing after it the favour of God in whom all happiness centres, and upon whom all things entirely depend? If God be with us who can be against us? What friends can we want, while in Him we have all that are truly valuable? Or what blessings can we desire, but what He is both willing and able to shower down upon us, only leaving it to Him to judge what is safest and most convenient for us? There is no pleasure in life comparable to that which arises in a good man's breast from the sense of his keeping up a friendly intercourse with God.

(D. Waterland, D. D.)

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KJV: And hereby we know that we are of the truth, and shall assure our hearts before him.

WEB: And by this we know that we are of the truth, and persuade our hearts before him,