ein gutes Pferd springt nicht höher, als es muss
proverb
as long as one does the necessary, there is no need to do more; one should try to be efficient, but not perfectionist
ein gutes Pferd springt nicht höher, als es muss is a German proverb meaning “as long as one does the necessary, there is no need to do more; one should try to be efficient, but not perfectionist”.