So it is with you, if you speak words [in an unknown tongue] that are not intelligible and clear, how will anyone understand what you are saying? You will be talking into the air [wasting your breath]!

has in these last days spoken [with finality] to us in [the person of One who is by His character and nature] His Son [namely Jesus], whom He appointed heir and lawful owner of all things, through whom also He created the universe [that is, the universe as a space-time-matter continuum].