Jesus compares the person who hears but does not obey his teaching to a man who builds a house that has no foundation and so will collapse when the flood comes. (See: [[rc://en/ta/man/translate/figs-simile]])
Some cultures may not know that a house with a foundation is stronger. Additional information may be helpful. Alternate translation: "but he did not dig down and build first a foundation" (See: [[rc://en/ta/man/translate/figs-explicit]])