Titus 3:3-7: "3 For we ourselves were once foolish, disobedient, led astray, slaved to various passions and pleasures, passing our days in malice and envy, hated by others and hating one another. 4 But when the goodness and loving kindness of God our Savior appeared, 5 he saved us, not because of works done by us in righteousness, but according to his own mercy, by the washing of regeneration and renewal of the Holy Spirit, 6 whom he poured out on us richly through Jesus Christ our Savior, 7 so that being justified by his grace we might become heirs according to the hope of eternal life."
John 14:6: "Jesus said to him [Thomas], 'I am the way, and the truth, and the life. No one comes to the Father except through me.'"
Philippians 3:7-9: "7 But whatever gain I had, I counted as loss for the sake of Christ. 8 Indeed, I count everything as loss because of the surpassing worth of knowing Christ Jesus my Lord. For his sake I have suffered the loss of all things and count them as rubbish, in order that I may gain Christ 9 and be found in him, not having a righteousness of my own that comes from the law, but that which comes through faith in Christ, the righteousness from God that depends on faith"
Acts 4:12: "And there is salvation in no one else, for there is no other name under heaven given among men by which we must be saved."
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The text is public domain:
Thy works, not mine, O Christ,Speak gladness to this heart;They tell me all is done,They bid my fear depart.
To whom save Thee,Who canst aloneFor sin atone,Lord, shall I flee?
Thy wounds, not mine, O Christ,Can heal my bruised soul;Thy stripes, not mine, containThe balm that makes me whole.
To whom save Thee,Who canst aloneFor sin atone,Lord, shall I flee?
Thy cross, not mine, O Christ,Has borne the crushing loadOf sins that none could bearBut the incarnate God.
To whom save Thee,Who canst aloneFor sin atone,Lord, shall I flee?
Thy death, not mine, O Christ,Has paid the ransom due;Ten thousand deaths like mineWould have been all too few.
To whom save Thee,Who canst aloneFor sin atone,Lord, shall I flee?
Thy righteousness, O Christ,Alone can cover me;No righteousness availsSave that which is of Thee.
To whom save Thee,Who canst aloneFor sin atone,Lord, shall I flee?
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The passage from Titus is in the first verse ("Thy works, not mine, O Christ"), and the passage from Philippians appears in the fifth ("Thy righteousness, O Christ, / Alone can cover me"). The other verses have a similar structure, so these two passages could be cited for all of them. Some of the specific words in the second verse come from Isaiah 53:5: "But he was wounded for our transgressions; he was crushed for our iniquities; upon him was the chastisement that brought us peace, and with his stripes we are healed."
John 14:6 and Acts 4:12 are the basis for the refrain. The phrasing also recalls John 6:68: "Simon Peter answered him, 'Lord to whom shall we go? You have the words of eternal life.'"