“Shee, you guys are so unhip it's a wonder your bums don't fall off.” 

“Exactly!" said Deep Thought. "So once you do know what the question actually is, you'll know what the answer means.” 

“If you try and take a cat apart to see how it works, the first thing you have on your hands is a non-working cat.” 

“The Guide says there is an art to flying", said Ford, "or rather a knack. The knack lies in learning how to throw yourself at the ground and miss.” 

“You live and learn. At any rate, you live.” 

“A learning experience is one of those things that says, 'You know that thing you just did? Don't do that.” 

“Why?' is always the most difficult question to answer. You know where you are when someone asks you 'What's the time?' or 'When was the battle of 1066?' or 'How do these seatbelts work that go tight when you slam the brakes on, Daddy?' The answers are easy and are, respectively, 'Seven-thirty in the evening,' 'Ten-fifteen in the morning,' and 'Don't ask stupid questions.” 

If you aren’t making mistakes, you aren’t taking enough risks.

You may encounter many defeats, but you must not be defeated. In fact, it may be necessary to encounter the defeats, so you can know who you are, what you can rise from, how you can still come out of it. 

The only real failure in life is not to be true to the best one knows. 

When it’s tough, will you give up or will you be relentless?

You can’t let your failures define you. You have to let your failures teach you.

It isn't what you do, but how you do it.

You can't let praise or criticism get to you. It's a weakness to get caught up in either one.

“It isn’t what you do, but how you do it.”

“If you’re not making mistakes then you’re not doing anything. I’m positive that a doer makes mistakes.”

“Well, if you’re true to yourself you’re going to be true to everyone else.”

“It’s what you learn after you know it all that counts.”

"Not with Women," said the duchess, shaking her head; "and women rule the world. I assure you we can't bear mediocrities. We women, as someone says, love with our ears, just as you men love with your eyes, if you ever love at all."

“tone of colour in a room or a morning sky, a particular perfume that you had once loved and that brings subtle memories with it, a line from a forgotten poem that you had come across again, a cadence from a piece of music that you had ceased to play— I tell you, Dorian, that it is on things like these that our lives depend.” 

"You call yesterday the past?"

Thought is all light, and publishes itself to the universe. It will speak, though you were dumb, by its own miraculous organ. It will flow out of your actions, your manners, and your face. It will bring you friendships. It will impledge you to truth by the love and expectation of generous minds.

“Yes,’ he cried, ‘you have killed my love! You used to stir my imagination. Now you don’t even stir my curiosity. You simply produce no effect. I loved you because you were marvelous, because you had genius and intellect, because you realized the dreams of great poets and gave shape and substance to the shadows of art. You have thrown it all away. You are shallow and stupid. My God! how mad I was to love you! What a fool I have been! You are nothing to me now. I will never see you again. I will never think of you. I will never mention your name. You can’t know what you were to me, once. Why, once… Oh, I can’t bear to think of it! I wish I had never laid eyes upon you! You have spoiled the romance of my life. How little you can know of love if you say it mars your art! Without your art you are nothing. I would have made you famous, splendid, magnificent. The world would have worshiped you, and you would have borne my name. What are you now? A third-rate actress with a pretty face.” 

“I wish you would tell me your secret. To get back my youth I would do anything in the world, except take exercise, get up early, or be respectable.”