Here is a challenge.
I am going to write something below which is wrong. There will be flaws and faulty movements and poor theology (as I think should be obvious). But I want someone to tell me why it is wrong, why it is flawed. Here it goes.
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A Christian is to be open and loving to his neighbor. And further more a Christian is to avoid greed and possessiveness. Indeed, our Lord even teaches us, "To one who strikes you on the cheek, offer the other also, and from one who takes away your cloak do not withhold your tunic either. Give to everyone who begs from you, and from one who takes away your goods do not demand them back."
Now, consider your door. It has a lock on it. Why? Why should you worry or fear the one who might take your goods - you should be glad to give -- if he take your cloak, give your tunic, if he takes your goods, do not demand them back.
What business do we have putting locks on our doors, striving vainly to protect what we think is "ours"? Trust God, not masterlock, and the Lord will protect and your goods as He sees fit.
To use a door lock is a sin, it is not commanded in the Scriptures, it denies the power of God (who passed through the locked door in John 20). It is wrong to lock your door.
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There's the challenge of the day - what's wrong with the above?