On the top lists of course:

"Great power comes with great responsibility"-Spiderman

"There are two type of loved one, the one you grow out of and the one you grow into, I just hope I'm the latter. You might not love me anymore but I let you go for now. Hoping that one day you fly back to me, cause I think your worth the wait."-Smallville

"I will never turn back on my words! This is my way of ninja"-Naruto