Answer:
I have all the knowledge you have. But I am so small that I can fit into your hands. What am I?
I am whole but incomplete. I have no eyes yet I see. You can see and see right through me. My largest part is one fourth of what I once was.
With three eyes and as black as night I frequently knock down ten men with a single strike!
Marking mortal privation when firmly in place. An enduring summation inscribed in my face.
I am a candy that looks like a shepherdβs staff.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?