A house is comprised of that which is below it, above it and of course the structure itself. That is, the foundation below, the ceiling above and the house itself. This is hinted to in the word בית, as it serves as an acronym for יסוד, בית, תקרה, foundation, house, ceiling.
The letter ב spelled out (ב,י,ת) spells בית, house. The construction of the letter ב alludes to the three aforementioned parts: The bottom of the beis refers to the foundation while the upper part alludes to the ceiling. In between these two is of course the house itself which is represented by the middle part of the construction of the letter ב.
We are instructed לרוחה פתוחיהי ביתך, let your house be open wide making it a center of hospitality. This teaching is reflected in the letter ב, which as we mentioned alludes to a house. The letter ב is open on the left side, hinting to us that a person should have his house open to others.
Many people in their quest for a house have been disappointed. One house was too expensive while another one was too far of a distance. Another one they were about to purchase but then the deal fell through. We must keep in mind that each person’s house is already designated for them and as a result they can go about this endeavor serenely. This is explicitly stated in the gemara which says that forty days before the formation of an embryo a bas kol, Heavenly voice issues forth and proclaims this particular house is destined for so-and-so (בית פלוני לפלוני).
