Gentlemen, you can't fight in here! This is the War Room.
President Merkin Muffley in Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb (1963) screenplay by Peter George, Terry Southern and Stanley Kubrick

To deny a concept is not to embrace its opposite. 
Buddhism Plain & Simple (2003) by Steve Hagen

Show me a woman who doesn't feel guilt, and I'll show you a man.
attributed to unnamed therapist in The Dance of Intimacy (1990) by Harriet Lerner

That's one small step for a man, one giant leap for mankind.
Neil Armstrong (20 July 1969) 

Be the change you want to see in the world.
Mohandas Karamchand Gandhi

When you're following an angel, does it mean you have to throw your body off a building? 
She's an Angel in Severe Tire Damage (1998) lyrics and music by They Might Be Giants (John Linnell and John Flansburgh)

Remember when you were 9 or 10 or 11, and maybe you were this tree-climbing, shit-free little girl who said, "It's not fair," and then at 12 or 13 you suddenly turned into a female impersonator who said, "How clever of you to know what time it is!" and all that stuff?  Well, what happens is that when you get to be 60, and the role is over, you go back to that clear-eyed, shit-free, I-know-what-I-want, I-know-what-I-think, 9 or 10 year old girl.  Only now, you have your own apartment.
Gloria Steinem as interviewed by Cynthia Gorney in Mother Jones ( November/December 1995) 

You cannot solve a problem by condemning it.
The Power of Intention (2004) by Wayne Dyer

Death cannot be assumed simply because signs of life are not present.
Masterman Finsbury to Michael Finsbury in The Wrong Box (1966) screenplay by Larry Gelbart and Burt Shevelove

What would you do if you knew you could not fail?
Mohandas Karamchand Gandhi

Cloquet hated reality but realized it was still the only place to get a good steak.
Woody Allen

I'm not much on rear window ethics.
Lisa to Jeff in Rear Window (1954) screenplay by John Michael Hayes

. . .  I still hold two truths with equal and fundamental certainty. One: the British did terrible things to the Irish. Two: the Irish, had they the power, would have done equally terrible things to the British. And so also for any other paired adversaries I can imagine. The difficulty is to hold on to both truths with equal intensity, not let either one negate the other, and know when to emphasize one without forgetting the other. Our humanity is probably lost and gained in the necessary tension between them both. I hope, by the way, that I do not sound anti-British. It is impossible not to admire a people who gave up India and held on to Northern Ireland. That shows a truly Celtic sense of humor.
A Long Way from Tipperary: A Memoir (2000) by John Dominic Crossan

Je n'ai fait celle-ci plus longue que d'habitude parce que je n'ai pas eu le loisir de la faire plus courte.   Blaise Pascal    translate

If there's anything more important than my ego around, I want it caught and shot now.
Zaphod Beeblebrox to Jillian in The Hitchhikers Guide To The Galaxy (1979) by Douglas Adams

All his life a man struggles to reach the top of the ladder, and finally he does -- only to discover it's against the wrong wall!
attributed to unknown in End the Struggle and Dance with Life (1996) by Susan Jeffers

We called her Mademoiselle because she was French and full of irregular verbs.
Thomas Clayton Campbell Jr. in Story of Three Loves (1953) screenplay by John Collier, George Froeschel and Jon Lusting)

For six months I vibrated like a musical saw.
Jane to Victor in The Unsuspected (1947) screenplay by Ranald MacDougall and Bess Meredyth, based on the novel by Charlotte Armstrong

Barn's burned down. Now I can see the moon.
Masahide (Sung Dynasty) in Zen Poetry (1995) translated by Lucien Stryk and Takashi Ikemoto

...I'm more impressionable when my cement is wet.
Greetings to the New Brunette in Talking With The Taxman About Poetry (1990) lyrics and music by Billy Bragg 

If you're not enjoying yourself, you are wasting your time!
End the Struggle and Dance with Life (1996) by Susan Jeffers

Decent clothes...a car...but what's it all about?
Alfie Elkins in Alfie (1966) screenplay by Bill Naughton

Someone gave me this glass, and I really like this glass. It holds my water admirably and it glistens in the sunlight. I touch it and it rings. One day the wind may blow it off my shelf, or my elbow may knock it from the table. I know this glass is already broken, so I enjoy it incredibly.
attributed to Achaan Chah Subato in End the Struggle and Dance with Life (1996) by Susan Jeffers