I believe this is from the Heidelberg Catechism (since that is the only thing close that I have found). And is actually question 21 & 22.
21. Q. What is true faith?

A. True faith is a sure knowledge whereby I accept as true all that God has revealed to us in His Word.1 At the same time it is a firm confidence2 that not only to others, but also to me,3 God has granted forgiveness of sins, everlasting righteousness, and salvation,4 out of mere grace, only for the sake of Christ's merits.5 This faith the Holy Spirit works in my heart by the gospel.6

1 John 17:3, 17; Heb. 11:1-3; James 2:19. 2 Rom. 4:18-21; 5:1; 10:10; Heb. 4:16. 3 Gal. 2:20. 4 Rom. 1:17; Heb. 10:10. 5 Rom.3:20-26; Gal. 2:16; Eph. 2:8-10. 6 Acts 16:14; Rom. 1:16; 10:17; I Cor. 1:21.
22. Q. What, then, must a Christian believe?

A. All that is promised us in the gospel,1 which the articles of our catholic and undoubted Christian faith teach us in a summary.

1 Matt. 28:19; John 20:30, 31.

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