ars gratia artis
Literal translation: art for the sake of art
In an English sentence: The starving artist often murmured, “ars gratia artis.”
Ars gratia artis is the motto of MGM studios. You can see the phrase on a banner under the MGM lion on the company logo. It means creating something beautiful for its own sake, not for the sake of profit.
From Elizabeth Heimbach's book Latin Everywhere, Everyday