Not Ayn Rand quotes but a few I've picked up here and there mainly from ex-mormon sources:
"It's fairly easy for an intelligent person to select the few facts that support a false idea, and to seem convincing, especially to people who are predisposed to believe the idea anyway. This assertion assumes no dishonesty or insincerity on the part of the scholar. In fact, it is a very common mistake when one is set on a particular conclusion before examining the evidence. People naturally see what they want to see, making it easy to ignore the 95% of the data that refutes the desired conclusion. It happens to the best of us."
"Human beings have what seems to be a pathological need to force their view of the world onto other people, and to marginalize them if they don't accept it"........Robert Kirby of the Salt Lake Tribune
"While testimonies of the truth may be like plants that need to be watered with constant study and prayer, beliefs in false systems of religion are also like plants, that need similar care lest the truth should sway you."
mckay