Answer:
The more you look at it, The less you see.
An utensil used for bread. Also a paper cutter. Used by a thug to take a life, Or wielded by the tamest wife, When used to spread the butter.
If you can get this professional's attention you can get where you need to go for a price.
If you drop me I'm sure to crack. But give me a smile and I'll always smile back.
What devours all and can kill a king. Destroy a town and crushes mountains down?
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?