Answer:
I am so simple that I can only point. Yet I guide men all over the world.
You must keep this thing. Its loss will affect your brothers. For once yours is lost, it will soon be lost by others.
There is an ancient invention. Still used in some parts of the world today. That allows people to see through walls.
I am always in front of you, but you will never see me. What am I?
Man walks over, and man swims under. In times of war, it can be burned asunder. What is it?
I fly to any foreign parts assisted by my spreading wings. My body holds an hundred hearts Nay I will tell you stranger things when I am not in haste I ride and then I mend my pace anon.