Answer:
The person who makes it has no need for it. The person who purchases it does not use it. The person who does use it does not know he or she is. What is it?
It's in your hand though you can not feel it. Only you and time can reveal it.
What always runs but never walks, often murmurs, never talks, has a bed but never sleeps, has a mouth but never eats?
Walk on the living, they don't even mumble. Walk on the dead, they mutter and grumble.
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.
What is so fragile that saying its name breaks it?
Difficult
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?