A.T. Robertson Commentary Matthew 20:15

"Is it not lawful for me to do what I will with mine own? or is thine eye evil, because I am good?" — Matthew 20:15 (ASV)

Is thine eye evil? (ο οφθαλμος σου πονηρος εστιν?) See on 6:22-24 about the evil eye and the good eye. The complainer had a grudging eye while the householder has a liberal or generous eye. See Ro 5:7 for a distinction between δικαιος and αγαθος.