2 Corinthians 3:18: "And we all, with unveiled face, beholding the glory of the Lord, are being transformed into the same image from one degree of glory to another. For this comes from the Lord who is the Spirit."
Colossians 3:1-10: "1 If then you have been raised with Christ, seek the things that are above, where Christ is, seated at the right hand of God. 2 Set your minds on things that are above, not on things that are on earth. 3 For you have died, and your life is hidden with Christ in God. 4 When Christ who is your life appears, then you also will appear with him in glory.
"5 Put to death therefore what is earthly in you: sexual immorality, impurity, passion, evil desire, and covetousness, which is idolatry. 6 On account of these the wrath of God is coming. 7 In these you too once walked, when you were living in them. 8 But now you must put them all away: anger, wrath, malice, slander, and obscene talk from your mouth. 9 Do not lie to one another, seeing that you have put off the old self with its practices 10 and have put on the new self, which is being renewed in knowledge after the image of its creator."
Psalm 51:10-12: "10 Create in me a clean heart, O God, and renew a right spirit within me. 11 Cast me not away from your presence, and take not your Holy Spirit from me. 12 Restore to me the joy of your salvation, and uphold me with a willing spirit."
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The text is public domain:
1 Renew me, O eternal Light,And let my heart and soul be bright,Illumined with the light of graceThat issues from Your holy face.2 Remove the pow'r of sin from meAnd cleanse all my impurityThat I may have the strength and willTemptations of the flesh to still.3 Create in me a new heart, Lord,That gladly I obey Your Word.Let what You will be my desire,And with new life my soul inspire.4 Grant that I only You may loveAnd seek those things which are aboveTill I behold You face to face,O Light eternal, through Your grace.
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2 Corinthians 3:18 appears in the first verse, although there's a bit of overlap here with Colossians 3:10 and Psalm 51:10.
The first part of the text from Colossians 3 appears in the fourth verse ("And seek those things which are above"), and the second part seems to appear at the end of the second verse ("That I may have the strength and will / Temptations of the flesh to still").
The passage from Psalm 51 appears in the third verse.
The line "Till I behold You face to face" in the fourth verse seems to come from the first part of 1 Corinthians 13:12: "For now we see in a mirror dimly, but then face to face."