Answer:
I am the beginning of eternity the end of time and space the beginning of every end the end of every place.
A dagger thrust at my own heart dictates the way I'm swayed. Left I stand and right I yield to the twisting of the blade. What am I?
When I am caught, I am thrown away. When I escape, you itch all day. What am I?
When set loose I fly away. Never so cursed as when I go astray.
My first is in riddle but not in little. My second is in think but not in brink. My third is in thyme but not in time. My fourth is in mother but not in brother. My last is in time but no t in climb.
What is lighter than what it is made of?