That the reason why they are not fallen already and do not fall now is only that God's appointed time is not come. For it is said, that when that due time, or appointed time comes, their foot shall slide. Then they shall be left to fall, as they are inclined by their own weight. God will not hold them up in these slippery places any longer, but will let them go; and then, at that very instant, they shall fall into destruction; as he that stands on such slippery declining ground, on the edge of a pit, he cannot stand alone, when he is let go he immediately falls and is lost.

The bow of God's wrath is bent, and the arrow made ready on the string, and justice bends the arrow at your heart, and strains the bow, and it is nothing but the mere pleasure of God, and that of an angry God, without any promise or obligation at all, that keeps the arrow one moment from being made drunk with your blood.

For when God is said by these things to try men and prove them, to see what is in their hearts and whether they will keep His commandments or no, we are not to understand, that it is for His own information, or that He may obtain evidence Himself of their sincerity (for he needs no trials for His information); but chiefly for their conviction, and to exhibit evidence to their consciences...
So when God tempted or tried Abraham with that difficult command of offering up his son, it was not for His satisfaction, whether he feared God or no, but for Abraham's own greater satisfaction and comfort, and the more clear manifestation of the favour of God to him.

There is a difference between having a rational judgment that honey is sweet, and having a sense of its sweetness. . . . So there is a difference between believing that a person is beautiful, and having a sense of his beauty. The former may be obtained by hearsay, but the lat- ter only by seeing the countenance.

The ingenerating of a principle of grace in the soul seems in Scripture to be compared to the conceiving of Christ in the womb... And the conception of Christ in the womb of the blessed virgin by the power of the Holy Ghost, seems to be a designed resemblance of the conception of Christ in the soul of a believer by the power of the same Holy Ghost.

Religion consists much in holy affection; but those exercises of affection which are most distinguishing of true religion are these practical exercises. Friendship between earthly friends consists much in affection; but those strong exercises of affection that actually carry them through fire and water for each other are the highest evidences of true friendship.

A truly humble man is sensible of his natural distance from God; of his dependence on Him; of the insufficiency of his own power and wisdom; and that it is by God's power that he is upheld and provided for, and that he needs God's wisdom to lead and guide him, and His might to enable him to do what he ought to do for Him.

"It is experience of ourselves, and finding what we are, that God commonly makes use of as the means of bringing us off from all dependence on ourselves. But men never get acquaintance with themselves so fast, as in the most earnest way of seeking [salvation]. They that are in this way have more to engage them to think of their sins, and strictly to observe themselves, and have much more to do with their own hearts, than others. Such a one has much more experience of his own weakness, than another that does not put forth and try his strength; and will therefore sooner see himself dead in sin. Such a one, though he hath a disposition continually to be flying to his own righteousness, yet finds rest in nothing; he wanders about from one thing to another, seeking something to ease his disquieted conscience; he is driven from one refuge to another, goes from mountain to hill, seeking rest and finding none; and therefore will the sooner prove that there is no rest to be found, nor trust to be put, in any creature whatsoever.

"It is therefore quite a wrong notion that some entertain, that the more they do, the more they shall depend on it. Whereas the reverse is true; the more they do, or the more thorough they are in seeking, the less will they be likely to rest in their doings, and the sooner will they see the vanity of all that they do.

[from "Pressing into the Kingdom of God"]