The Best Anime catchphrase in my opinion is "With A Keen Eye For Details,One Truth Prevails!"~Shinichi (Jimmy) Kudo well that was his catchphrase in the FUNimation english dub.
I found a few amazing anime quotes! I'll share a few of them!:
"I always thought that life was about standing your ground, no matter how strong the current was. But going with the flow isn't so bad after all. As long as it takes you forward."
Osaki Nana (Nana)
"Humankind cannot gain anything without first giving something in return. To obtain, something of equal value must be lost. That is alchemy's first law of equivalent exchange. In those days, we really believed that to be the world's one and only truth."
Alphonse Elric (Full Metal Alchemist)
"I want to break up while i can still say i love you."
Shindou Chihiro (Ef: A Tale of Memories)