No serpent of sin will breed there

(Thomas Watson, "The Lord's Prayer")

"Nothing impure will ever enter it." Revelation 21:27

The kingdom of heaven excels all other kingdoms in
holiness. Earthly kingdoms are for the most part unholy;
there is a common sore of luxury and uncleanness running
in them. Earthly kingdoms are stages for sin to be acted on.
"All the tables are covered with vomit and there is not a spot
without filth." Isaiah 28:8. But the kingdom of heaven is so
holy—that it will not mix with any corruption. It is so pure a
soil—that no serpent of sin will breed there. There, beauty
is not stained with lust, and honor is not swelled with pride.
Holiness is the brightest jewel of the crown of heaven.

"Nothing impure will ever enter it." Revelation 21:27