It translates to "He Conquers Who Conquers Himself." It means that a person who overcomes his weaknesses or failings, who is able to control his emotions and actions, wins life's most important battle. It is an adaptation of a phrase by Publilius Syrus, a Latin writer of maxims (1st century BC). He wrote: Bis vincit qui se vincit in victoria meaning “He conquers twice who conquers himself when he is victorious” -- control your urge to be arrogant, smug, cruel, or vindictive when you win.

"Vincit qui se vincit" is inscribed on one of the stained glass windows of the Beast's palace in the animated Disney film "Beauty and the Beast" and is likely a family motto.