I had this dream.

We were walking along the beach.
Across the dark sky flashed scenes from your life.

For each scene, there was two sets of footprints in the sand - one belonging to you and one to me.

You looked back at the footprints in the sand.
You noticed that at many times along the path of your life, especially at the very lowest and saddest times, there was only one set of footprints.

You wondered:
"You said once I decided to be with you, you'd walk with me all the way - but I noticed that during the saddest and the most troublesome times of my life, there was only one set of footprints. I don't understand why, when I needed you the most, you would leave me."

I replied:
"I love you. I would never ever leave you. When you saw only one set of footprints - it was when I carried you."