Jesus' miracle consists, not only in His omniscience—knowing that the fish would yield the necessary money—but also in the fact that the first fish that took Peter's hook contained the precise sum required. The purpose and pleasure of Christ's will—which all creation obeys—guided that single fish out of multiple schools in the lake to Peter's hook. Christ, the Lord of Creation, controls all things, even the sea's fish and the earth's silver.
In describing Christ as the Word, the apostle John writes, "All things were made through Him, and without Him nothing was made that was made" (John 1:3). Paul confirms this in Colossians 1:16, "For by Him all things were created that are in heaven and that are on earth, visible and invisible, whether thrones or dominions or principalities or powers. All things were created through Him and for Him."
Using His spiritual power, He makes a fish produce the exact amount of silver coin to pay the Temple dues. This miracle reminds the disciples that He is indeed the omnipotent Son of God who controls all creation.