life before he knoweth it, and many misapprehensions of himself and other things, yet it will not follow that he hath no life. So when Christians find a flaw in their first comforts, they are apt to judge it a flaw in their safety. Many come under doubting, through the exceeding weakness of their natural parts. Many honest hearts have weak heads, and know not how to perform the work of self-trial. They will acknowledge the premises, and yet deny the apparent conclusion. If God do not some other way supply the defect of their reason, I see not how they should have clear and settled peace. One great and too common cause of distress is, the secret maintaining some known sin. This abates the degree of our graces, and so makes them more undiscernible. It obscureth that which it destroyeth not; for it beareth such sway, that grace is not in action, nor seems to stir, nor is scarce heard speak for the noise of this corruption. It puts out, or dimmeth the eye of the soul, and stupifies it, that it can neither see nor feel its own condition. But especially it provokes God to withdraw himself, his comforts, and the assistance of his Spirit, without which we may search long enough before we have assurance. God hath made a separation between sin and peace. As long as thou dost cherish thy pride, thy love of the world, the desires of the flesh, or any unchristian practice, thou expectest comfort in vain. If any man _setteth up his idols in his heart, and putteth the stumbling-block of his iniquity before his face, and cometh to a_ minister, or to God, _to inquire_ for comfort; instead of comforting him, God _will answer him that cometh, according to the multitude of his idols_.[281] Another very great and common cause of the want of comfort is, when grace is not kept in constant and lively exercise. The way of painful duty, is the way of fullest comfort. Peace and comfort are Christ's great encouragements to faithfulness and obedience; and therefore, though our obedience does not merit them, yet they usually rise and fall with our diligence in duty. As prayer must have faith and fervency to procure it success, besides the blood and intercession of Christ, so must all other parts of our obedience. If thou growest seldom, and customary, and cold in duty, especially in thy secret prayers to God, and yet findest no abatement in thy joys, I cannot but fear thy joys are either carnal or diabolical. Besides grace is never apparent and sensible to the soul, but while it is in action; therefore want of action must cause want of assurance. And the action of the soul upon such excellent objects, naturally bringeth consolation with it. The very act of loving God in Christ is inexpressibly sweet. The soul that is best furnished with grace, when it is not in action, is like a lute well stringed and tuned, which while it lieth still, maketh no more music than a common piece of wood; but when it is handled by a skilful musician, the melody is delightful.