Answer:
It's in your hand though you cannot feel it. Only you and time can reveal it.
My second is performed by my first, and it is thought a thief by the marks of my whole might be caught.
You fill it and it empties, A metaphor for plenty, Depending on what half you see, It's either full or empty
White and thin, red within, with a nail at the end. What is it?
Useful term for when you need to start a fire or notice someone with the same shirt as you.
Do what he says and you'll be fine, don't and you lose the game.