Much is lost, in reading the Scriptures, by not noting exactly what they say. Here we have literally, "the faith of Christ," just as in Rev.14:12 we have "the faith of Jesus." He is the Author and Finisher of faith. Heb.12:2. God has "dealt to every man the measure of faith" (Rom.12:3), in giving Christ to every man. "Faith cometh by hearing, and hearing by the Word of God" (Rom.10:17), and Christ is the Word. All things are of God. It is He who gives repentance and forgiveness of sins.

There is, therefore, no opportunity for any one to plead that his faith is weak. He may not have accepted and made use of the gift, but there is no such thing as "weak faith." A man may be "weak in faith," that is, may be afraid to depend on faith, but faith itself is as strong as the Word of God. There is no faith but the faith of Christ; everything else professing to be faith is a spurious article.

I see this a little differently. Ellen White presents the faith spoken of in Rev. 14:12 as essentially faith for salvation, something which doesn't apply to Christ. She points out that in the third angel's message we have the law (the commandments of God) and the gospel (the faith of Jesus).
Of course faith is also necessary to keep the commandments of God, and this could find a parallel in Christ's experience but, as I said, I see Ellen White's main emphasis here as being faith in Christ as the sinners' only hope of salvation (justification).

6Sacrifice and offering thou didst not desire; mine ears hast thou opened: burnt offering and sin offering hast thou not required.

7Then said I, Lo, I come: in the volume of the book it is written of me,

8I delight to do thy will, O my God: yea, thy law is within my heart.

9I have preached righteousness in the great congregation: lo, I have not refrained my lips, O LORD, thou knowest.

10I have not hid thy righteousness within my heart; I have declared thy faithfulness and thy salvation: I have not concealed thy lovingkindness and thy truth from the great congregation.

11Withhold not thou thy tender mercies from me, O LORD: let thy lovingkindness and thy truth continually preserve me.

12For innumerable evils have compassed me about: mine iniquities have taken hold upon me, so that I am not able to look up; they are more than the hairs of mine head: therefore my heart faileth me.

13Be pleased, O LORD, to deliver me: O LORD, make haste to help me. (Psalm 40)

i didnt make clear that Jesus relied on the Father to keep from sinning, not for salvation.