The very first line of the show is Judas saying "My mind is clearer now." This means that Judas thinks he knows better -- that he has all the answers -- that he sees things that Jesus doesn't see.
Judas' last lines are "My mind is darker now. I've been used and you knew all along." This is when he realizes that he was wrong, but was fulfilling his destiny.
-PJ
You're good. I'd never noticed that before.
Except, IIRC, it's "My mind is in darkness now."
My sister and I used to sing the musical to each other during the long summer months. I still know over 80% of it by heart.
Shalom.