Adam Clarke on Job 9:8

And treadeth upon the waves - This is a very majestic image. God not only walks upon the waters, but when the sea runs mountains high, he steps from billow to billow in his almighty and essential majesty. There is a similar sentiment in David, Psa 29:10 : "The Lord sitteth upon the flood; yea, the Lord sitteth King for ever." But both are far outdone by the Psalmist, Psa 18:9-15, and especially in these words, Psa 18:10, He did fly on the wings of the wind. Job is great, but in every respect David is greater.