Another good entry point is song, here Cantiones Sacrae pro quinis vocibus, Sacred Chants for five voices.
The letter that looks like a weird “f” is an “s”, so it is posterius, root word for posterity, from Latin posteritas or posterus (“following, coming after”), but here, when combined with prius, means before and after.
There is another meaning of posterity: the offspring of one progenitor to the furthest generation, which harkens back to Eve and looks forward to Mary who is the second Eve.
The English translation rhymes. An English tutor is happy to hear a student say, “I am taking Latin next year," and I have.
Peter Phillips was a boy chorister, composer, and organist who fled England. He was ordained a Catholic priest after his wife and child died.