Arcana Coelestia #138
138. Verse 18 And Jehovah God said, It is not good that the man should be alone. I will make for him a help suitable for him. 'Alone' means that he was not content to be guided by the Lord but desired to have self and the world as his guide. 'A help suitable for him' means the proprium, which, further on, is also called 'the rib which was built into a woman'.
Matthew 19:4-6
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He answered, "Haven't you read that he who made them from the beginning made them male and female,
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and said, 'For this cause a man shall leave his father and mother, and shall join to his wife; and the two shall become one flesh?'
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So that they are no more two, but one flesh. What therefore God has joined together, don't let man tear apart."