The conclusion of The Imitation of Christ implores us to be bold in our Faith especially in the face of temptation.
“Be not anxious, stand not to dispute with thy thoughts, nor to answer the doubts which the devil suggests. But believe the words of God, believe His saints and prophets, and the wicked enemy will fly from you. It is often very profitable to the servants of God to suffer such things, for the devil tempts not unbelievers and sinners whom he already surely possesses, but the faithful and devout he, in many ways, tempts and molests. Go forward, therefore, with a sincere and undoing faith. And with a humble reverence, approach this Sacrament. And whatsoever you are not able to understand, commit securely to almighty God. For God deceives thee not, but he is deceived who trusteth too much in himself.”
Episode 17 of The Commentaries dives into the conclusion of Book Four of The Imitation of Christ, chapters 15-18.