Hello, I found two online sources with this. I don't understand why futurus is used instead of futurum....Sis, Jesu, nostrum gaudium,
qui es futurus praemium:
sit nostra in te gloria,
per cuncta semper saecula.
...O Jesus, may you be our joy,
You who are our future reward.
May our glory be in you
Throughout all eternity.