everyone remembers "i'll make an offer he won't refuse", maybe the people that actually never saw the godfather trilogy, or just watch it once thinks that quote it's actually the most important or the greatest. well...

...for me, a few of the best quotes are: 

• "i know it was you, Fredo. you broke my heart, you broke my heart!"
• "oh, Michael. Michael, you are blind. it wasn't a miscarriage. it was an abortion. an abortion, Michael. just like our marriage is an abortion."
• "just when i thought i was out... they pull me back in!" 
• "never hate your enemies, it affects your judgment." 
• "leave the gun, take the cannoli."  

but the three films are filled with great lines. i can't get enough of these movies!