The next step
I think some issues of the spirit take prominence when all else is found wanting. You've tried everything practical, everything social, everything material, and still its not enough. It's all been exhausted. Various science of mind paradigms, disciplines, warrior codes just work for a while, then fall apart. Pleasure fades too fast. All that's left is the next step because there is no place else to go.
So giving the light a chance to enter, a presence, a God, the God, and relating to it is what's left. It has to be explored too. As said, it's the next step. It will all come short too. You'll be disappointed eventually. But still, it's where you have to go.
Sanity, realism, soberness, all just goes so far. One has to leapfrog to these other levels. And they too don't stick. But where else is there to go? You can't stay still or go backwards. Somehow you have to settle in to this spiritual realm.