New Grace for New Trials

The grace which may meet and subdue the temptations of the present moment, may not be appropriate and adequate to the temptations of any future time. Every day and every moment bring their duties and trials, and need their appropriate grace. There must, therefore, be constantly repeated acts of faith; and by means of faith a constant application of the atoning efficacy of the blood of the Cross; both to preserve against the power of existing temptation, and also to wash the mind from the impurity of its stains, when we have already yielded to it. We would observe, finally, that temptations are profitable trials of the religious life, and are particularly calculated to purify and strengthen our faith. They are grievous for a time, it is true; but they are calculated to secure, in the end, the peaceable fruits of righteousness. Very few have become strong in faith, who have not passed through great trials. It is said of the Savior himself, that he "learned obedience by the things which he suffered."

— edited from The Interior or Hidden Life (1844)  Part 1, Chapter 19.