And so in the matter of the envoys of the princes of Babylon, who had been sent to him to inquire about the sign that had been done in the land, God left him to himself, in order to test him and to know all that was in his heart.2 Chronicles 32:31
Hezekiah was growing so inwardly great and priding himself so much upon the favor of God that self-righteousness crept in, and because he trusted in himself, the grace of God was for a time, in its more active operations, withdrawn. If the grace of God were to leave the best Christian, there is enough sin in his heart to make him the worst of transgressors. If left to yourselves, you who are warmest for Christ would cool down like Laodicea into sickening lukewarmness: You who are sound in the faith would be white with the leprosy of false doctrine; you who now walk before the Lord in excellency and integrity would reel to and fro and stagger with a drunkenness of evil passion. Like the moon, we borrow our light; bright as we are when grace shines on us, we are darkness itself when the Sun of Righteousness withdraws Himself.
Therefore, let us cry to God to never leave us. "Take not Your Holy Spirit from me! Do not withdraw from us Your indwelling grace! Have You not said, 'I, the LORD, am its keeper; every moment I water it. Lest anyone punish it, I keep it night and day'?1 Lord, keep us everywhere. Keep us when we're in the valley so that we do not grumble against Your humbling hand; keep us when we're on the mountain, so we do not lose our balance by being lifted up; keep us in youth, when our passions are strong; keep us in old age, when becoming conceited in our wisdom, we may therefore prove greater fools than those who are young and silly; keep us when we come to die, in case at the very end we should deny You! Keep us living, keep us dying, keep us working, keep us suffering, keep us fighting, keep us resting, keep us everywhere, for everywhere we need You, O our God!"
1) Isaiah 27:3