count it all joy pt. 2

For if our heart condemn us, God is greater than our heart, and knoweth all things. 

- 1 John 3:20

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Nobody can always have devout feelings: and even if we could, feelings are not what God principally cares about. Christian Love, either towards God or towards man, is an affair of the will. If we are trying to do His will we are obeying the commandment, 'Thou shalt love the Lord thy God.' He will give us feelings of love if He pleases. We cannot create them for ourselves, and we must not demand them as a right. 

- C.S. Lewis, Mere Christianity

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This means that while their spirit can be directed to an eternal object, their bodies, passions, and imaginations are in continual change, for as to be in time means to change. Their nearest approach to constancy, therefore, is undulation-- the repeated return to a level from which they repeatedly fall back, a series of troughs and peaks.
If you had watched your patient carefully you would have seen this undulation in every department of his life-- his interest in his work, his affection for his friends, his physical appetites, all go up and down. As long as he lives on earth periods of emotional and bodily richness and liveliness will alternate with periods of numbness and poverty. 

[...] 

Now it may surprise you to learn that in His efforts to get permanent possession of a soul, He relies on the troughs even more than on the peaks; some of His special favourites have gone through longer and deeper troughs than anyone else. 

[...] 

He will set them off with communications of His presence which, though faint, seem great to them, with emotional sweetness, and easy conquest over temptation. Sooner or later He withdraws, if not in fact, at least from their conscious experience, all those supports and incentives. He leaves the creature to stand up on its own legs-- to carry out from the will alone duties which have lost all relish. It is during such trough periods, much more than during the peak periods, that it is growing into the sort of creature He wants it to be. Hence the prayers offered in the state of dryness are those which please Him best. 

- C.S. Lewis, The Screwtape Letters