Meaning of salus populi suprema lex esto*

sa•lus po•pu•li su•pre•ma lex es•to

Pronunciation: (sä'loos pô'poo-lē" s-prā'mä leks es'tō Eng. sā'l&schwas pop'y&schwa-lī"soo-prē'm&schwa leks es'tō), [key]
— Latin. Latin.
  1. let the welfare of the people be the supreme law: a motto of Missouri.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.