Indeed, life is the very antithesis of certainty and this scares the hell out of most of us. Instead of imbuing life with a false structure and stability, some brave souls among us learn to embrace change, embrace flow, and embrace spontaneity and creativity.
This is the path to true peace.
The reason we can't get out of the rut is because we give the rut existence by wanting to get out of it. We can't let go of the rut because we are resisting it. It's like either flowing with the stream of life or swimming against the stream. Life is change that is what it is.
But the rut is what we feel when we resist change like putting our hand in a creek and feeling the flow of water against it.
When I resist my own life, I think that feeling of water against my hand is ME, and I don't want to give ME up...so I continue to resist the stream of my own life. Let go....and the rut disappears.
Above the water consciousness or light, below the water unconscious or darkness; most of our being is below water.
Spiritual path is discovering how to become more conscious and see our iceberg, which melts when it gets in the light of consciousness.
I don't remember where I read it, but I read it somewhere along the way and it's a great pointer:
But the first rule of survival is really counterintuitive:
"Adapt (change) or die."
The conservative mind has a really hard time with this.