Truly, truly, I say to you, unless a grain of wheat falls into the earth and dies, it remains alone; but if it dies, it bears much fruit.
John 12:24 ESV
If you've lost the thrill . . . in your marriage, in a friendship, in your home, in your job . . . maybe God has you just where he wants you. In Mere Christianity, C.S. Lewis discusses the danger of living on a diet of thrills.
People get from books the idea that if you have married the right person you may expect to go on ‘being in love’ for ever. As a result, when they find they are not, they think this proves they have made a mistake and are entitled to a change — not realizing that, when they have changed, the glamour will presently go out of the new love just as it went out of the old one. In this department of life, as in every other, thrills come at the beginning and do not last. The sort of thrill a boy has at the first idea of flying will not go on when he has joined the R.A.F. and is really learning to fly. The thrill you feel on first seeing some delightful place dies away when you really go to live there.
Does this mean it would be better not to learn to fly and not to live in the beautiful place? By no means. In both cases, if you go through with it, the dying away of the first thrill will be compensated for by a quieter and more lasting kind of interest. What is more (and I can hardly find words to tell you how important I think this), it is just the people who are ready to submit to the loss of the thrill and settle down to the sober interest, who are then most likely to meet new thrills in some quite different direction. The man who has learned to fly and become a good pilot will suddenly discover music; the man who has settled down to live in the beauty spot will discover gardening.
This is, I think, one little part of what Christ meant by saying that a thing will not really live unless it first dies. It is simply no good trying to keep any thrill: that is the very worst thing you can do. Let the thrill go — let it die away — go on through that period of death into the quieter interest and happiness that follow — and you will find you are living in a world of new thrills all the time. But if you decide to make thrills your regular diet and try to prolong them artificially, they will all get weaker and weaker, and fewer and fewer, and you will be a bored, disillusioned old man for the rest of your life. It is because so few people understand this that you find many middle-aged men and women maundering about their lost youth, at the very age when new horizons ought to be appearing and new doors opening all round them. It is much better fun to learn to swim than to go on endlessly (and hopelessly) trying to get back the feeling you had when you first went paddling as a small boy.
When the thrill disappears our senses should be heightened. Good things are on the horizon. Why? Because God is not a programmer of boredom. Jesus came to give life--right now--and onto eternity. Let the thrill go that new thrills may come.
 C.S. Lewis. Mere Christianity. New York: HarperCollins Publishers. Pages 110-111. Lewis wrote this in his chaper, "Christian Marriage.'