The only way that I can answer that is that God is at work in my life giving me a 'Holy Contentment'. It has to be from Him. After all I have never rested very well. And the fact that I am learning to be still and rest, day after day, can only be from Him. It's hard for those of us that were raised with a strong work ethic. Our self image was tied up with our roles, what we accomplished and what we could get done every day.
But now none of those things matter any more. Instead it is about resting, eating well, getting my daily exercise and learning to listen to the One who holds the future. As a friend reminded me,
"God is under no obligation to reveal to me today what He will make known to me tomorrow."
Jesus calls me to trust Him one day at a time. For now, that's how I am living, one day at a time. It has to be a God-thing don't you agree? :-)
Come to Me, all who are weary and heavy-laden, and I will give you rest." (Matthew 11:28 NASB)