Cyril of Alexandria — as excerpted in the Catena Aurea on Luke 12:4-7

“For it is not absolutely to every one that this discourse seems to apply, but to those who love God with their whole heart to whom it belongs to say, Who shall separate us from the love of Christ? (Rom. 8:3.) But they who are not such, are tottering, and ready to fall down. Moreover our Lord says, Greater love hath no man than this, that a man lay down his life for his friends. (John 15:13.) How then is it not most ungrateful to Christ not to repay Him what we receive?”