In Ezekiel 40:42, they signify as follows: height, degrees of good and truth from the Highest or Inmost to the lowest or outermost; length, good; breadth, truth. (Apocalypse Explained 627[4])

In Revelation 21:16, they signify that all things of the New Jerusalem are from the good of love and equal; length signifies the good of love; breadth, truth from that love, and height, good and truth together in every degree. (Apocalypse Revealed 907)