“Art is the lie that enables us to realize the truth.” 
― Pablo Picasso

“The unexamined life is not worth living.”
― Socrates

“Truth is stranger than fiction, but it is because Fiction is obliged to stick to possibilities; Truth isn't.” 
― Mark Twain,

“In a time of deceit telling the truth is a revolutionary act.” 
― George Orwell

“A thing is not necessarily true because a man dies for it.” 
― Oscar Wilde

“Facts do not cease to exist because they are ignored.” 

“The truth will set you free, but first it will piss you off.”