Chapter 21 from The Book of Mysteries. Disclaimer : The Book of Mysteries is not my book; I'm just someone sharing the mysteries and ideas from within the book for others in the world. All credit goes to Johnathan Cahn.

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We were sitting on two large stones at the base of a small mountain. The teacher leaned down to the ground, picked up a rock, and handed it to me.
"What do you feel?" He asked.
"Nothing," I replied, "A rock."
"Now put your hand on your neck. Do you feel anything?"
"My heartbeat."
"But the rock has no heartbeat," he said.
"Of course not."
"The rock exists as a rock with no heartbeat. It retains its shape, its size, it's consistency, with no need of a heartbeat. But you have a heartbeat. Every moment of your existence hangs on a heartbeat. The moment it stops, your existence is over. That's the difference between a rock and your life. It must strive to exist, fight to exist. Your heart keeps beating, every moment of your life. Even if you do nothing, your heart beats. Even when you sleep, it keeps beating every moment so that you can remain alive. If you waste your moments on Earth, still it beats that you can waste your life. When you sin, when you gossip, when you covet and hate, still it beats while you do so. When you weep, when you give up hope, still it beats so that even in your tears and despair, it still fights for you to live and to be able to cry."
"So the difference between my existence and that of a rock is...."
"Your life doesn't just exist; it strives to exist. Your life is a miracle. Your every moment is a miracle. Your joys are a miracle. Even your tears are a miracle. Your life is the gift from God. Every moment is sustained by Him. Every moment is a miracle."
"How does one apply this?"
"You cease taking your life for granted. You stop wasting it, mistreating it, treating it as something less than a miracle it is. You cease to allow your life to be given to sin and what is less than God's will. You treasure the existence with which you were entrusted. You stop throwing away your moments. You treat your life and your time on earth as a treasure. You treat your every moment as if there was a heart beating behind it, striving for that moment to exist. In short....You live a life worthy.....Of ever heartbeat."

The mission : Live this day in the miracle of your existence. Take account of every heartbeat and make your moments worthy of each one.

Psalms 139:14-17