You have heard a great deal about me but do not know me.
Though you do not know me, at times you fear me..
I am not fast but you will never catch me.
You look to me for daily guidance but I cannot give you definite answers.
Others claim to see me but I am not present.
Without me, you cease to exist.
What am I?
(Post your guesses in the comment section and I will answer it this afternoon.)