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Neither JWs nor people of any other denomination are going to be rewarded for their Christian works. In Matthew 7:22, 23, the people Jesus condemned were not those who say, "Lord, Lord, did we not go door-to-door in Jehovah's name, and in his name attend many meetings, and in his name refuse blood transfusions?" The condemned ones are prophesying, exorcising and miracle working in the name of Jesus, things that JWs don't claim to do.
What counts with Jesus is doing "the will of my Father who is in heaven." (Matthew 7:21) But the 'doing' is not what we ordinarily define as 'doing.' Jesus' view of 'doing' is given in verse 24: "Therefore everyone who hears these words of mine and acts on them may be compared to a wise man who built his house on the rock."
Acting on Jesus' words is not necessarily working for a church, visiting the sick, feeding the poor, distributing Bibles or in other ways spreading the gospel. It can include those actions, but not every Christian is capable of or in a position to do those things.
Jesus was concluding his Sermon on the Mount. "These words of mine" are the things he taught in that Sermon. Acting upon "these words" has to do with the heart and with the way we live. And as he indicated in the Sermon's final illustration, our Christian way of life will be put through severe testing. (Matthew 7:24-27) Whether we claim to be Christians as JWs or of any other denomination or of no denomination at all, we will be rewarded only if we pass such tests as trial, temptation, bereavement, sickness, poverty and death in a way that satisfies the divine Judge.
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