"A man with conviction is a hard man to change. Tell him you disagree and he turns away. Show him facts and figures and he questions your sources. Appeal to logic and he fails to see your point… presented with evidence - unequivocal and undeniable evidence - that his belief is wrong, he will emerge not only unshaken but even more convinced of the truth of his beliefs than ever before. Indeed he may even evince new fervor about convincing and converting others to his view."
Leon Festinger, author of When Prophecy Fails
“In science it often happens that scientists say, you know that's a really good argument; my position is mistaken, and then they actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion”.
- Carl Sagan
