Doubts and certainty, opinions and truth (video)

After doubting for a little while, I've decided to make a video on doubts and certainty.

Since I've covered the topic in the vid, I won't elaborate much further. Instead, I post a selection of great quotes on the topic:

"Cherish those who seek the truth but beware of those who find it." (Voltaire)

"The discovery of truth is prevented more effectively not by the false appearance of things present and which mislead into error, not directly by weakness of the reasoning powers, but by preconceived opinion, by prejudice." (Schopenhauer)

"When a thing is new, people say: 'It is not true.' Later, when its truth becomes obvious, they say: 'It is not important.' Finally, when its importance cannot be denied, they say: 'Anyway, it is not new.'" (William James, 1896)

"Loyalty to a petrified opinion never yet broke a chain or freed a human soul." (Mark Twain)

"A great many people think they are thinking when they are merely rearranging their prejudices." (William James)

"The deplorable mania of doubt exhausts me. I doubt about everything, even my doubts." (Gustave Flaubert)

"There is nothing so absurd that it cannot be believed as truth if repeated often enough." (William James)