Darkness cannot be defeated. It can only be hidden in the form of hatred
Code Geass meaning to me is that you should fight for something even if you don't have the required things to win, luck might be on your side. Also another thing Code geass meaning is that the if you have power, you aren't condemned into a life of Solitude, you aren't selfish. AND ANOTHER thing it means is that Life without change might be called anything except for life.
Guilty Crown meaning is that even the weak can make a big change in someone's life and how ALOT of people live.
Naruto meaning has one main one for me, NEVER GIVE UP!