Moses led the Hebrew Children out of Egypt…but none of them ever saw the Promised Land due to their unbelief.  Instead, they wandered in the desert for 40 years…going around and around the same mountain.  Doubt and unbelief wastes time.  God tells us to do something, but out of unbelief, we say “No!”  So God sends us around the mountain to think about it.  Soon, His tells us one more time the thing He wants us to do.  If we again say “No!”,  guess where He sends us…wandering around that same mountain!  Unbelief wastes time…precious time that we could be changing lives for Christ if we had said “Yes!” the first time.