Answer:
What can go through glass without breaking it?
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.
Talks like this, a green wise man does. Guess my clue, you will.
Though I wander the earth, I am no longer here. I am pale and I chill everyone near. Who am I?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?
The warmer I am the fresher I am.