Lyrics of Let on

Since i was a kid
I've watched what i've said
My tongue's cut and swollen
From all the times i've bit
I held everything in
Played dumb
I did
Now everyone's sayin'
She's so out of it
But i know much more than i let on

They talk behind my back
I don't react
The world is just a train
And i'm the tracks
But when they least expect
I'll speak at last
They'll all turn and ask
"how did you know that?"
And i'll say, "i know much more than i let on"