He looks on the earth, and it trembles: he touches the hills, and they smoke.
Read Chapter 104
Augustine of Hippo
AD 430
"Who looketh on the earth, and maketh it tremble; who toucheth the hills, and they shall smoke" (ver. 32). The hills were proud, and boastful of themselves, God had not touched them: He toucheth them, and they shall smoke. What meaneth the smoking of the hills? That they pray unto the Lord. Behold great hills, proud hills, vast hills, prayed not to God: they wished themselves to be entreated, and entreated not Him who was above them. For what powerful, arrogant, proud man is there upon the earth, who deigneth humbly to entreat God? I speak of the ungodly, not of the "cedars of Libanus, which the Lord hath planted." Every ungodly man, unhappy soul, knoweth not how to entreat God, while he wisheth himself to be entreated by men. He is a hill; it is needful that God touch him, that he may smoke: when he hath begun to smoke, he will offer prayers unto God, as it were the sacrifice of his heart. He smoketh unto God, he then beateth his breast: he beginneth to weep, for smoke doth elicit tea...
43. "Who looketh on the earth, and maketh it tremble; who toucheth the hills, and they shall smoke" (ver. 32). O earth, thou wast exulting in thy good, to thyself thou didst ascribe thy fulness and opulence; behold, the Lord looketh on thee, and causeth thee to tremble. May He look on thee, and make thee tremble: for the trembling of humility is better than the confidence of pride. ...For it is God, he saith, which worketh in you. For this reason then with trembling, because God worketh in you. Because He gave, because what thou hast cometh not from thee, thou shall work with fear and trembling, for if thou fearest not Him, He will take away what He gave. Work, therefore, with trembling. Hear another Psalm: "Serve the Lord with fear, and rejoice unto Him with trembling." If we must rejoice with trembling, God beholdeth us, there cometh an earthquake; when God looketh upon us, let our hearts tremble; then will God rest there. Hear Him in another passage: "Upon whom shall My Spirit rest?...