The key

I've got this feeling, something I cannot hide, you can see it anytime by just looking into my eyes!

My eyes reveal a secret, buried deep inside, my heart is its keeper and the key you've gotta have.

Just follow every clue, catch every glimpse, my soul will tell you the way to get the key.

Watch me carefully, come, I'll let you in, I'm waiting for you only and that day my life will begin

(According to http://iwl.me this texts looks like one from Harry Harrison)