Which stilleth the noise of the seas - He calms the seas when they have been agitated by the storm. He causes the mighty waves to settle down, and the whole surface of the ocean becomes calm and smooth. The storm subsides at his command, and the sea is still. It was the manifestation of this power which demonstrated so clearly the divinity of the Lord Jesus, when he said to the troubled waves, "Peace, be still, and the wind ceased, and there was a great calm." Mark 4:39. Compare Psalm 107:29.
The noise of their waves - The loud roar of the waters, so that they are still.
And the tumult of the people - The raging; the fury; the excitement of assembled multitudes, resembling the raging waves of the ocean. This comparison is very common. See Isaiah 17:12-13. Compare the notes at Revelation 19:6. This is perhaps a more striking and wonderful exhibition of the power of God than that of calming down the waves of the ocean. In the one case, it is the exertion of mere power on nature, acting through its established laws, and where there is no resistance of will; in the other, it is power exerted over the will; power over agents conscious that they are free, and where the worst passions meet and mingle and rage.

Stilleth the noise of the seas - Thou art Sovereign over all the operation of sea and land. Earthquakes are under thy control: so are the flux and reflux of the sea; and all storms and tempests by which the great deep is agitated. Even the headstrong multitude is under thy control; for thou stillest the madness of the people.

Which stilleth the (f) noise of the seas, the noise of their waves, and the tumult of the people.
(f) He shows that there is no part or creature in the world which is not governed by God's power and providence.

Which stilleth the noise of the seas, the noise of their waves,.... By a word speaking; as our Lord did when here on earth, and which was a proof and evidence of his eternal power and Godhead. These figurative expressions are interpreted by the next clause;
and the tumult of the people: of wicked men, who foam and rage against the people of God, and are like a troubled sea that cannot rest; but God can say to these proud waters, which threaten to go over their souls, Peace, be still; he can stop their opposition, quell their insurrections, restrain their wrath, and make them peaceable and quiet; wherefore the saints have no reason to be afraid of them, Psalm 46:2.

Tumult - No less wild and impetuous.