If we are not able to ask skeptical questions, to interrogate those who tell us something is true -- to be skeptical of those in authority, then we are up for grabs for the next charlatan, political or religious, that comes ambling along.
Carl Sagan, 1996
Here is where he said it, one of his last interviews. Ironically recent advanced on that time cured him from a pre-cancerous disease. He surely lived 5 years more because of science, the same one he defended above pseudosiences on his last book.