Now Faith, in the sense in which I am here using the word, is the art of holding on to things your reason has once accepted, in spite of your changing moods. For moods will change, whatever your view your reason takes. I know that by experience. Now that I am a Christian I do have moods in which the whole thing looks very improbable: but when I was an atheist I had moods in which Christianity looked terribly probable. This rebellion of your moods against your real self is going to come anyway. That is why Faith is such a necessary virtue: unless you teach your moods ‘where they get off’, you can never be either a sound Christian or even a sound atheist, but just a creature dithering to and fro, with its beliefs really dependent on the weather and the state of its digestion. Consequently one must train the habit of Faith.

The first step is to recognize the fact that your moods change. The next is to make sure that, if you have once accepted Christianity, then some of its main doctrines shall be deliberately held before your mind for some time every day. That is why daily prayers and religious readings and churchgoing are necessary parts of the Christian life. We have to be continually reminded of what we believe. Neither this belief nor any other will automatically remain alive in the mind. It must be fed. And as a matter of fact, if you examined a hundred people who had lost their faith in Christianity, I wonder how many of them would turn out to have been reasoned out of it by honest argument? Do not most people simply drift away?

C.S. Lewis - Mere Christianity

What we know will be in continuous battle with what we feel. We may strive to figure out what God is doing but too often our conclusions will be flawed by our emotions. God’s ways cannot always be known, but His Truth can be held onto.

1 Corinthians 2:16
“For who has known the mind of the Lord that he may instruct him?” But we have the mind of Christ.

The idea of living in the unresolved place between living as Christ and death being gain and the quandry of faith that Lewis writes of is but an echo of how Paul charged Timothy (notice the hope and how it is held onto by what we know about our Lord):

II Timothy 3:10-17
You, however, know all about my teaching, my way of life, my purpose, faith, patience, love, endurance, persecutions, sufferings—what kinds of things happened to me in Antioch, Iconium and Lystra, the persecutions I endured. Yet the Lord rescued me from all of them. In fact, everyone who wants to live a godly life in Christ Jesus will be persecuted, while evil men and impostors will go from bad to worse, deceiving and being deceived. But as for you, continue in what you have learned and have become convinced of, because you know those from whom you learned it, and how from infancy you have known the holy Scriptures, which are able to make you wise for salvation through faith in Christ Jesus. All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness, so that the man of God may be thoroughly equipped for every good work.

When we’re in the most unresolved place and our emotions/mood/feelings are getting the best of us and we are ready to quit (and best) or run away (at worst), there is hope in who we know. Hope in the One who persevered for us and who knew us all the while.