I like this quote by Lewis. What he is saying is that faith will not always be apparent. There are days that God cannot be seen or felt -- much like the days when the sun cannot be seen or frigid days when its warmth cannot be sensed. And yet, even on cloudy and cold days, everything else finds its place only by the sun. The air, the light, the being of the earth... all these things find their place through the sun. The imagery is apt when speaking of Christ. Seen or unseen, all things find their place through Him.
"And He is before all things and by Him all things consist."