Charles H. Spurgeon on Psalms 30:7

It is rare to receive much of this world, and not as the prodigal to go afar off; it is hard to keep close to God in prosperity, when we have much of this world to live upon and content ourselves with; to live upon God, and make him our content and stay, as if we had no other life nor livelihood but in him; we are very apt in such a case to contract a carnal frame, let go our hold of God, discustom ourselves to the exercise of faith, abate and estrange our affections from God. See how it was with David: "I said, I shall never be moved, thou hast made my mountain so strong." I solaced myself on these outward accommodations, as if I needed no other support, strength, or content, and there were no fear of a change; no care now to make God my constant joy and stay, and reckon upon God only for my portion, and that I must follow him with a cross, and be conformed to my Saviour, in being crucified to the world. What comes of this? Thou didst hide thy face, and I was troubled; namely, because he had too much indulged a life of sense. Children that are held up by their nurses' hand, and mind not to feel their feet and ground when the nurses let them go, they fall, as if they had no feet or ground to stand upon. Or thus: we are like children, who, playing in the golden sunshine, and following their sport, stray so far from their father's house, that night coming upon them ere they are aware, they are as it were lost, and full of fears, not knowing how to recover home. The world steals away our hearts from God, gives so few opportunities for the exercise of the life of faith, and such advantages to a life of sense, wears off the sense of our dependence on God, and need thereof, so that when we are put to it by affliction, we are ready to miscarry ere we can recover our weapon or hold. Faith is our cordial Ps 27:13; now if it be not at hand (as in health, when we have no need of it, it use to be) we may faint ere we recover the use of it. Elias Pledger's Sermon in "The Morning Exercises," 1677.