The best intelligence test is what we do with our leisure.
There are other comments above that are just as bad (Goethe, Adams, Casnocha whose statements I generally like, Feynman who statements I almost always dislike) but I will pick on this one.
These quotes aren't really about rationality and the awesome power of an effective tool. They're about the smugness of being right. I'd say leave your superiority out of it, and prefer statements that balance the power of the tool with the humility of being human (Russell, Confusion, Munroe, Maxim 22).
A monthly thread for posting any interesting rationality-related quotes you've seen recently on the Internet, or had stored in your quotesfile for ages.