Board Thread:Theories and Speculation/@comment-27719597-20160202055116/@comment-26894845-20160203132229

If you read about the sharingan and the mangekyo, then you would know that you just need a powerful emotion about someone you care for to awaken the sharingan initially, but to get the mangekyo, it requires that pain and suffering occur, and to get the eternal mangekyo, you have to replace your eyes with a close relative.