Was, and is, and is to come!

I am currently reading a book; Rivers in the Desert, which is a collection of prayers and meditations, that was given to me to use as I journeyed through DDP. I've found I can only read a little at a time, as there is continually an interesting thought or idea that provokes me.
I liked this sentence; 'Holy, holy, holy is the Lord God Almighty, who was, and is, and is to come', because it generates an image of God as beyond the mere scrap of understanding that we can hope to establish as human beings. It suggests that He is beyond our reckoning, and that we are completely at the mercy of such a timeless being. I find this image to be incredibly comforting, as it allows me to trust in His plan, and in His knowledge, a knowledge that stretches beyond the constraints of our time.
This book came with many pencil markings, and thanks to the dilligence of it's previous reader I can tell you that this verse came from Rev. 4:8b!