Resolved, never to do anything which I should be afraid to do if it were the last hour of my life. - Jonathan Edwards

"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"]

Tis a more glorious effect of power to make that holy that was so depraved and under dominion of sin, than to confirm holiness on that which before had nothing of the contrary.

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.