68:18 Ascended - This has a manifest reference to Christ, and his ascension into heaven, in whom alone it is literally accomplished, and to whom therefore it is ascribed, Eph 4:8. Although the expressions are borrowed from the ancient custom of princes, who, after some glorious achievements, used to go up into their royal cities in triumphant chariots, being attended by their captive enemies, and afterward to distribute gifts to their soldiers and subjects, and sometimes to do some acts of clemency even to their rebels and enemies. Captivity - Those whom thou hast taken captive; death and sin, and the devil, and all the enemies of Christ, and of his people, whom Christ led in triumph, having spoiled them, and making a shew of them openly, Col 2:15. Received - According to thy manhood thou hast received from God all the treasures of wisdom and knowledge, and all those gifts and graces of the Holy Spirit, which are necessary either to the perfection of thy nature, or to the good of thy church and people. Rebellious - Thy most stubborn and rebellious enemies, whether Jews or Gentiles. Might dwell - That he who as man is ascended into the highest heavens, might, as God, come down to them, and dwell with them, not only in and by his ordinances in which he is present, but also by his spirit dwelling in their hearts.

Psalm 68:18 Parallel Commentaries

And That, Being Raised from the Dead, He was to Ascend into Heaven...
And that, being raised from the dead, He was to ascend into heaven, (Ps. lxviii 17) David says thus: The chariot of God (is) ten-thousandfold, thousands are the drivers: [263] the Lord (is) among then in Sinai in (his) sanctuary. He ascended up on high, he led captivity captive: he received, he gave gifts to men. And by captivity he means the destruction of the rule of the apostate angels. [264] He declares also the place where He was to ascend into heaven from the earth. For the Lord, he says, from …
Irenæus—The Demonstration of the Apostolic Preaching

The Ascension of Christ
It seemed expedient for him to stay, to accomplish the conversion of the world. Would not his presence have had an influence to win by eloquence of gracious word and argument of loving miracle? If he put forth his power the battle would soon be over, and his rule over all hearts would be for ever established. "Thine arrows are sharp in the heart of the king's enemies; whereby the people fall under thee." Go not from the conflict, thou mighty bowman, but still cast thine all-subduing darts abroad. …
Charles Haddon Spurgeon—Spurgeon's Sermons Volume 17: 1871

Twentieth Day for God's Spirit on the Heathen
WHAT TO PRAY.--For God's Spirit on the Heathen "Behold, these shall come from far; and these from the land of Sinim."--ISA. xlix. 12. "Princes shall come out of Egypt; Ethiopia shall haste to stretch out her hands to God."--PS. lxviii. 31. "I the Lord will hasten it in His time."--ISA. lx. 22. Pray for the heathen, who are yet without the word. Think of China, with her three hundred millions--a million a month dying without Christ. Think of Dark Africa, with its two hundred millions. Think …
Andrew Murray—The Ministry of Intercession