salus populi suprema lex esto

Latin phrase

sa·​lus po·​pu·​li su·​pre·​ma lex es·​to ˌsä-ˌlüs-ˈpȯ-pu̇-ˌlē-su̇-ˌprā-mä-ˌleks-ˈe-stō 

: let the welfare of the people be the supreme law

—motto of Missouri