When I first read the shirt, I thought it said "I used to think was knowledge power..." and from looking at some other comments, I don't think I'm the only one. I think if you moved the "was" above the "knowledge" it would flow a lot better. I really love the phrase though. Don't change the quote at all
a bit of a critique, you might want to move the "was". standard reading flow draws a likeness between the fontset and color of "think" and "was", making it read like "I used to think was knowledge power". for ease of flow, "was" should probably be moved either between or to the other side of the two words.
I lol'd though when I sorted it out xD this is something my sister would wear xD
I can see your point, but I'd rather not enter a new version now, this one's picked up quite a lot of steam. Perhaps if it got chosen I could think about altering that. Thanks very much for the advice, and i'm glad you like it!