Some writers use the word charity to describe not only Christian love between human beings, but also God’s love for man and man’s love for God.... On the whole, God’s love for us is a much safer subject to think about than our love for Him. 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. But the great thing to remember is that, though our feelings come and go, His love for us does not. It is not wearied by our sins, or our indifference; and, therefore, it is quite relentless in its determination that we shall be cured of those sins, at whatever cost to us, at whatever cost to Him.
C.S. Lewis, Mere Christianity (1952; Harper Collins: 2001) 132-133.