Charles H. Spurgeon on Psalms 68:18

Thou hast led captivity captive. The expression is emphatic. He has conquered and triumphed over all the powers which held us in captivity, so that captivity itself is taken captive. The spirit and force of it is destroyed; and his people, when released by him, and walking in his ways, have no more to apprehend from those whose captives they were, than a conqueror has to fear from a prisoner in chains. The energy of the phrase is not unlike that of the apostle: "Death is swallowed up in victory." John Newton.