Proverbs 19:10

8 He who acquires wisdom loves himself; one who safeguards understanding will find success.

9 A false witness will not go unpunished, and one who pours out lies will perish.

Luxury is unseemly for a fool— how much worse for a slave to rule over princes!

11 A man’s insight gives him patience, and his virtue is to overlook an offense.

12 A king’s rage is like the roar of a lion, but his favor is like dew on the grass.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB
Luxury is unseemly for a fool— how much worse for a slave to rule over princes!
KJV
Delight is not seemly for a fool; much less for a servant to have rule over princes.
WEB
Delicate living is not appropriate for a fool, much less for a servant to have rule over princes.
ASV
Delicate living is not seemly for a fool; Much less for a servant to have rule over princes.
DARBY
Good living beseemeth not a fool; how much less for a servant to have rule over princes.
BLB
Luxury [is] not fitting for a fool—even less for a slave to rule over princes.
ÅB
Vellevnet høver ikke for en dåre, enda mindre høver det for en slave å herske over fyrster.
OTB
Overflod er ikke passende for en dåre; enda mindre for en tjener å styre over adelige.
B1930
Vellevnet høver ikke for en dåre, enda mindre høver det for en træl å herske over fyrster.

Study notes (Tyndale)

Original text and word study

Cross references