This statement probably refers to a man relying on his property and wealth for security. If so, then "house" here represents the owner's property and wealth. Alternate translation: "He thinks he will be safe because he is wealthy, but he will not be safe" (See: [[rc://en/ta/man/translate/figs-metaphor]])
This negative statement emphasizes the opposite. It can be stated in positive form. Alternate translation: "he will fall down" (See: [[rc://en/ta/man/translate/figs-litotes]])
This negative statement emphasizes the opposite. It can be stated in positive form. Alternate translation: "it will fall down" (See: [[rc://en/ta/man/translate/figs-litotes]])