Joy Comes through the Word
I do not know how strong in the Spirit others are. But I cannot become as holy as some imagine themselves to be, however learned and full of the Spirit I might be. I still constantly find that when I am without the Word, Christ is gone, yes, and so are joy and the Spirit. But as soon as I look at a psalm or a passage of Scripture, it so shines and burns into my heart that I gain a different spirit and mind. Moreover, I know that everybody may daily experience this in his own life.
(What Luther Says - p. 691 - para 2141)