Remember, O man, there is nothing of all the labours or services, the acts of zeal or devotion, that thou canst practise in public, but a subtle hypocrite may so nearly imitate the same, that it will be hard to discover the difference. There is nothing of all these outward forms, therefore, that can safely and infallibly distinguish thee from a hypocrite and false professor; for the same actions may proceed from inward motions and principles widely different. If you would obtain any evidence that you are a christian indeed, you must make it appear to your own conscience by the exercises of the hidden life, and the secret transactions between God and your soul. He was not a Jew of old, who was one outwardly in the letter only; nor is he a christian, who has mere outward forms; but a Jew or a christian, in the sight of God, is such a one as hath the religion in his heart, and in spirit, _whose praise is not of men, but of God_? Rom. ii. 28, 29. II. Inference. The life of a saint is a matter of wonder to the sinful world; for they know not what he lives upon. The sons of ambition follow after grandeur and power; the animals of pleasure pursue all the luxuries of sense; the miser hunts after money, and is ever digging for gold. It is visible enough what these wise men live upon. But the christian, who lives in the power and glory of the divine life, seeks after none of these, any farther than as duty leads him, and the supports and conveniencies of life are needful, in the present state of his habitation in the flesh. The sinner wonders what it is the saint aims at, while he neglects the tempting idols that himself adores, and despises the gilded vanities of a court, and abhors the guilty scenes of a voluptuous life. Christ and his children are, and will be, signs and wonders to the age they live in; Is. viii. 18. compared with Heb. ii. 13. The men of this world wonder what a christian can have to say to God in so many retiring hours as he appoints for that end; what strange business he can employ himself in; how he can lay out so much time in affairs, which the carnal mind has no notion of. On the other hand, the saint, when he is in a lively frame, thinks that all the intervals of his civil life, and all the vacant seasons that he can find between the necessary duties of his worldly station, are all little enough to transact affairs of such awful importance as he has to do with God, and little enough to enjoy those secret pleasures, which the stranger is unacquainted with. The children of God pray to their heavenly Father in secret, and they feel unknown refreshment and delight in it; and they are well assured, that _their Father who seeth in secret will hereafter reward them openly_; Mat. vi. 6.