Final answer:
The unclean spirit returns with seven other spirits more wicked than itself to dwell in the house, which is metaphorically speaking about a person's spiritual state rather than actual spirits in a dwelling.
Step-by-step explanation:
The question refers to a passage from the Bible, specifically Matthew 12:43-45. When the unclean spirit finds the house empty, swept, and in order, it decides to return with seven other spirits more wicked than itself. The spirits then enter and dwell there, and the final condition of that person is worse than the first. This is a metaphor indicating that if a person is 'cleansed' but no positive traits or virtues are cultivated in their place, then they become susceptible to even worse influences than before.
The reference to a spirit house in Thailand demonstrates a cultural practice aimed at placating spirits to avoid them causing trouble. While this is related since it involves spirits, the Bible passage is more about the spiritual state of a person rather than literal spirits in a house.