Charles H. Spurgeon on Psalms 107:31

Oh. This verse seems to include the ardent earnestness of the psalmist's spirit, that seamen would be much in thankfulness, and much and frequent in praising of the Lord their deliverer out of all their distresses. "Oh", seems he to say, that I could put men upon this duty, it would be more comfortable to me, seems the psalmist to say, to find such a principle in the hearts of those that are employed in the great waters, than any one thing in the world again whatsoever. "Oh" is but a little word consisting of two letters, but no word that ever man utters with his tongue comes with that force and affection from the heart as this doth. "Oh" is a word of the highest expression, a word when a man can say no more. This interjection oftentimes starts out of the heart upon a sudden from some unexpected conception, or admiration, or other. —Daniel Pell.