How Do You Know lyrics

I've got my doubts and I've got my questions
It's nothing new 'cause I've seen them before
I've had my share of false revelations
It always seems they're knockin' on my door

You said that I should see the light
But sometimes faith is blind
[ Lyrics from: http://www.lyricsmode.com/lyrics/t/third_day/how_do_you_know.html ]
How do you know, how do you know
What I'm suppose to be doing
Why do you go, why do you go on
Thinking you know my fate
So many times I've lost my step
But never lost my way
How do you know, how do you know
When I don't know myself

You're thinking that you've got all the answers
You've got my situation figured out
But you're only seeing part of the picture
There's so much more that you don't know about

And here you come to speak your mind
But I'll say one more time