Kevin's Riddle Time (Feb.17)

I never was, am always to be,

None ever saw me, nor ever will,

And yet I am the confidence of all,

Who live and breth on this terrestrial.

Answer: __ __ __ __ __ __ __ __

*The answer is in the comment section.*

Clue: there are three "O"s, and two "R"s

terrestrial: earth