Answer:
rub me and a genie might appear
I am in the past never in the future. I don't exist but have existed. I saw what you saw and that is what I will ever see.
I am just two and two. I am hot. I am cold. I am the parent of numbers that cannot be told. I am a gift beyond measure a matter of course. I am given with pleasure when taken by force.
What kind of coat can only be put on when wet?
I am shared by goats devils and unicorns.
I'm the source of all emotion but I'm caged in a white prison.