Answer:
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.
My teeth are sharp, my back is straight, to cut things up it is my fate.
What type of paper can you neither read nor write on?
As destructive as life, As healing as death; An institutioner of strife, Just as prone to bless. It is all that is good, Yet with an evil trend; As it was the beginning of things, It can also be the end.
What can't you see, hear or feel, until its too late. What shadows love, and shopkeepers hate?
You can always find me in the past. I am created in the present, but the future can not change me. What am I?