"To boldly go where no man has gone before." 

— Captain James T. Kirk

"We prefer to help ourselves. We make mistakes, but we're human—and maybe that's the word that best explains us."

— Captain James T. Kirk

"One man cannot summon the future."

"But one man can change the present!"

— Spock and Kirk

"Compassion: that's the one things no machine ever had. Maybe it's the one thing that keeps men ahead of them."

— Dr. McCoy

"You can use logic to justify almost anything. That's its power. And its flaw."

— Captain Cathryn Janeway

"There is a way out of every box, a solution to every puzzle; it's just a matter of finding it."

— Captain Jean-Luc Picard

"I canna' change the laws of physics."

— Montgomery "Scotty" Scott

"Insufficient facts always invite danger."

— Spock

"KHAAANNN!" 

— Captain James T. Kirk

"Highly illogical."

— Spock

"Without freedom of choice there is no creativity."

— Captain James T. Kirk

"Change is the essential process of all existence."

— Spock

"I am pleased to see that we have differences. May we together become greater than the sum of both of us."

— Surak

"Improve a mechanical device and you may double productivity. But improve man, you gain a thousandfold."

— Khan Noonien Singh

"Things are only impossible until they're not."

— Captain Jean-Luc Picard

"Computers make excellent and efficient servants, but I have no wish to serve under them."

— Spock

"It is possible to commit no errors and still lose. That is not a weakness. That is life."

— Captain Jean-Luc Picard to Data

"It is the lot of 'man' to strive no matter how content he is."

— Spock