Hearing and doing the Son’s words is bedrock. Hearing and building on sand is official religion without obedience.
The flood and wind idiom belongs with prophetic storms that take cities.
Matthew 7 ends the sermon with a collapse. Matthew 24 later describes a house left desolate. The sand-house is the old order; the rock-house is the people founded on the Son’s word.
When the storm of that war arrived, only one building project remained.
The house on the rock is already the New Creation community.