Labor omnia vincint means "hard work conquers all." That is all that I can tell you; not why this is the Oklahoma motto.
Mpumalanga's motto is 'Omnia labor vincit'.
The motto of Altinópolis is 'Labor Omnia Vincite Improbus'.
The motto of Strathallan School is 'Labor omnia vincit'.
Montfort College's motto is 'Labor Omnia Vincit'.
Balmoral College's motto is 'Labor Omnia Vincit'.
"Labor conquers all".(In the form Labor omnia vincit, or "hard work conquers all", it is the state motto of Oklahoma.)
Royal Pioneer Corps's motto is 'Labor omnia vincit'.
The motto of William Allitt School is 'Labor omnia vincit'.
Centenary College of Louisiana's motto is 'Labor Omnia Vincit'.
Montfort Secondary School's motto is 'Labor Omnia Vincit'.
The motto of Kajang High School is 'Labor omnia vincit'.
The motto of Wayne Community College is 'Labor Omnia Vincit'.