Karl Karnadi

“In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would 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

“The cure for a fallacious argument is a better argument, not the suppression of ideas.”
― Carl Sagan

“Extraordinary claims require extraordinary evidence.”
― Carl Sagan

“Science is not only compatible with spirituality; it is a profound source of spirituality.”
― Carl Sagan, The Demon-Haunted World: Science as a Candle in the Dark