Charles H. Spurgeon on Psalms 30:6

In my prosperity I said, I shall never be moved. Our entering upon a special service for God, or receiving a special favour from God, are two solemn seasons, which Satan makes use of for temptation...We are apt to get proud, careless, and confident, after or upon such employments and favours; even as men are apt to sleep or surfeit upon a full meal, or to forget themselves when they are advanced to honour. Job's great peace and plenty made him, as he confesseth, so confident, that he concluded he should "die in his nest." Job 29:18. David enjoying the favour of God in a more than ordinary measure, though he was more acquainted with vicissitudes and changes than most of men, grows secure in his apprehension that he "should never be moved; "but he acknowledgeth his mistake, and leaves it upon record as an experience necessary for others to take warning by, that when he became warm under the beams of God's countenance, then he was apt to fall into security; and this it seems was usual with him in all such cases —when he was most secure he was nearest some trouble or disquiet. "Thou didst hide thy face" —and then to be sure the devil will show him his —"and I was troubled." Enjoyments beget confidence; confidence brings forth carelessness; carelessness makes God withdraw, and gives opportunity to Satan to work unseen. And thus, as armies after victory growing secure, are oft surprised; so are we oft after our spiritual advancements thrown down. Richard Gilpin.