Charles H. Spurgeon on Psalms 104:32

He looketh on the earth, and it trembleth. The Lord who has graciously displayed his power in acts and works of goodness might, if he had seen fit, have overwhelmed us with the terrors of destruction, for even at a glance of his eye the solid earth rocks with fear. He toucheth the hills, and they smoke. Sinai was altogether on a smoke when the Lord descended upon it. It was but a touch, but it sufficed to make the mountain dissolve in flame. Even our God is a consuming fire. Woe unto those who shall provoke him to frown upon them, they shall perish at the touch of his hand. If sinners were not altogether insensible a glance of the Lord's eye would make them tremble, and the touches of his hand in affliction would set their hearts on fire with repentance. "Of reason all things show some sign, " except man's unfeeling heart.