“I don't believe you until you tell me, do you really believe, for example, if they say they are Catholic, "Do you really believe that when a priest blesses a wafer, it turns into the body of Christ? Are you seriously telling me you believe that? Are you seriously saying that wine turns into blood?"”

Finny, on his trust in Gene.
Source: A Separate Peace (1959), P. 163

Source: Obsidian Butterfly

I Don't Believe You, written by Pink and Max Martin
Song lyrics, Funhouse (2008)

2010s, 2010
Context: Just because you in Washington and you who are so out of touch with life in the media, just because you don't believe in anything doesn't mean nobody else does. We do. You know why you're confused by this show? It's because I believe in something. You don't.
Tea parties believe in small government. We believe in returning to the principles of our founding fathers. We respect them, we revere them. Shoot me in the head before I stop talking about the founders. Shoot me in the head if you try to change our government — I will stand against you. And so will millions of others. We believe in something. You in the media and most in Washington don't. The radicals that you and Washington have co-opted and brought in wearing sheep's clothing — change the pose. You will get the ends. You've been using them? They believe in Communism. They believe and have called for revolutionar — a revolution. You're going to have to shoot them in the head. But warning: they may shoot you.
They are dangerous because they believe. Karl Marx is their George Washington. You will never change their mind. And if they feel you have lied to them — they're revolutionaries. Nancy Pelosi, those are the people you should be worried about.
Here is my advice when you're dealing with people who believe in something that strongly — you take them seriously. You listen to their words and you believe that they will follow up with what they say.

"Fade Away"
Song lyrics, The River (1980)

Source: Gargantua and Pantagruel (1532–1564), Third Book (1546), Chapter 52 : How a certain kind of Pantagruelion is of that nature that the fire is not able to consume it
Context: I have already related to you great and admirable things; but, if you might be induced to adventure upon the hazard of believing some other divinity of this sacred Pantagruelion, I very willingly would tell it you. Believe it, if you will, or otherwise, believe it not, I care not which of them you do, they are both alike to me. It shall be sufficient for my purpose to have told you the truth, and the truth I will tell you.

Why You Wanna Treat Me So Bad?
Song lyrics, Prince (1979)

From Picasso, His Life and Work, Sir Roland Penrose, (1981), p. 413
Attributed from posthumous publications

Source: Home with God: In a Life That Never Ends