Where is that quote from? It’s perfect.
It is perfect!
Stupidity cannot be cured with money, or through education, or by legislation. Stupidity is not a sin, the victim can’t help being stupid. But stupidity is the only universal capital crime: the sentence is death, there is no appeal, and execution is carried out automatically and without pity.
Robert A. Heinlein, Time Enough For Love
It’s from one of the notebooks of Lazarus Long, part of “Time Enough For Love” by Robert Heinlein.