Having faith in what Jesus said is not the same as having faith in your own works or anything else. So it's more specific than just "faith." Your faith has to be on the blood and righteousness of the only begotten Son of God, the Lord Jesus Christ, as that's what he himself has said justifies before God. In order to have the one faith, you have to turn away from all other faiths, you have to forsake them. That's what it means by repent.
For if Abraham were justified by works, he hath whereof to glory; but not before God.
For what saith the scripture? Abraham believed God, and it was counted unto him for righteousness.
Now to him that worketh is the reward not reckoned of grace, but of debt.
But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness.
Even as David also describeth the blessedness of the man, unto whom God imputeth righteousness without works,
Saying, Blessed are they whose iniquities are forgiven, and whose sins are covered.
Blessed is the man to whom the Lord will not impute sin.
2 Corinthians 5:21
For he hath made him to be sin for us, who knew no sin; that we might be made the righteousness of God in him.
Philippians 3:8-9
Yea doubtless, and I count all things but loss for the excellency of the knowledge of Christ Jesus my Lord: for whom I have suffered the loss of all things, and do count them but dung, that I may win Christ,
And be found in him, not having mine own righteousness, which is of the law, but that which is through the faith of Christ, the righteousness which is of God by faith:
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Remember also Romans 7:22—
For I delight in the law of God after the inward man: