What does Ephesians 4:11 mean?

Therefore he says, “When he ascended on high, he led captivity captive, and gave gifts to men.”

Now this, “He ascended”, what is it but that he also first descended into the lower parts of the earth?

He who descended is the one who also ascended far above all the heavens, that he might fill all things.

for the perfecting of the saints, to the work of serving, to the building up of the body of Christ;

until we all attain to the unity of the faith, and of the knowledge of the Son of God, to a full grown man, to the measure of the stature of the fullness of Christ;

that we may no longer be children, tossed back and forth and carried about with every wind of doctrine, by the trickery of men, in craftiness, after the wiles of error;