John Calvin Commentary Matthew 9:22

"But Jesus turning and seeing her said, Daughter, be of good cheer; thy faith hath made thee whole. And the woman was made whole from that hour." — Matthew 9:22 (ASV)

Take courage, my daughter. This expression shows the weakness of her faith, for had there been no impropriety in her trembling, Christ would not have corrected it by exhorting her to take courage. Yet, at the same time, he commends her faith; and this supports the view which I have already stated, that while she sought Christ by the guidance of the Spirit, and from a sincere and pious desire, she hesitated in such a manner as to need to be strengthened.

Thus, we see that faith, in order to please God, needs forgiveness, and is at the same time sustained by new aid, that it may acquire additional strength. We may here draw a comparison from the health of the body to that of the soul: for as Christ says that the woman’s deliverance from her disease was the consequence of her faith, so it is certain that we obtain by faith the forgiveness of sins, which reconciles us to God.