Nouns ending in -esse are feminine.
The suffix often marks an abstract quality.
Is messe masculine or feminine?
lamesse
The rule behind it
100% of -esse nouns are feminine
In context
Tu devrais aller à la messe plus souvent.
You should go to mass more often.
Vous devriez aller à la messe plus souvent.
You should go to mass more often.
Elle allait tous les jours à la messe.
She went to mass every day.