tnGrk “the”; in context the article is used as a possessive pronoun (ExSyn215).
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sn Jesus warns that excessive concern for family ties (looks back) will make the kingdom a lesser priority, which is not appropriate for discipleship. The image is graphic, for who can plow straight ahead toward a goal while looking back? Discipleship cannot be double-minded.
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snThe kingdom of God is a major theme of Jesus. It is a realm in which Jesus rules and to which those who trust him belong. See Luke 6:20; 11:20; 17:20–21.