Man is enslaved by passions
I guess Jesus means freedom from passions whan He says

And ye shall know the truth, and the truth shall make you free. (Joh*8:32*KJV)

Knowing the truth is knowing the Godhead in Jesus

Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me. (Joh*14:6*KJV)

and knowing His love which surpasses all knowledge

And to know the love of Christ, which passeth knowledge, that ye might be filled with all the fulness of God. (Eph*3:19*KJV)

This can only be achieved through beholding the glory of the Lord

But we all, with open face beholding as in a glass the glory of the Lord, are changed into the same image from glory to glory, even as by the Spirit of the Lord. (2Co*3:18*KJV)

The glory of the Lord was revealed to men in Transfiguration

And was transfigured before them: and his face did shine as the sun, and his raiment was white as the light. (Mat*17:2*KJV)
...and we beheld his glory, the glory as of the only begotten of the Father, full of grace and truth. (Joh*1:14*KJV)