21.   It is a spirit that should never know a boundary and never know a reason to define one.

22.   It is a voice that knows its boundaries for now and tries not to go too far beyond them.

23.   One cannot sally merrily forth to hunt without knowing the boundaries of the zone one is in and the seasons for that zone.

24.   One lesson is that fatal stupidity knows no boundaries.

25.   Robert Dittman knows no boundaries.

26.   Sixermania clearly knows no boundaries.

27.   Surely there has been an incentive to communicate in a language that needs no translation and knows no boundaries.

28.   The ego knows no boundaries.

29.   The Kennedys are the quintessential American family, but in-law problems know no boundaries.

30.   The love of a parent knows no boundaries.