Looking for origin, name of writer...

Any information pertaining to this song or poem. It looks like latin, and it also has an english translation. Will post the music later.

Ad Mortem Festinamus

Ad Mortem Festinamus
"With Death We Dance"

Scribere proposui de contemptu mundano
I write here of the cruelty of existence
ut degentes seculi non mulcentur in vano.
else the time will pass in vain.
Iam est hora sugere a sompno mortis pravo.
It is the hour when we awaken in the face of death.

Vita brevis breviter in brevi finietur--
Life is short and soon will end--
mors venit velociter quae neminem veretur
death comes faster than you'd believe.
Omnia mors perimit et nulli miseritur.
It destroys all, and is without any mercy.

AD MORTEM FESTINAMUS
PECCARE DESISTAMUS!
WITH DEATH WE DANCE
DON'T WANT TO TRESSPASS ANY MORE!

Ni conversus fueris et sicut puer factus
If you don't become as innocent as a child
et vitam mutaveris in meliores actus
and change your life joyfully
intrare non poteris regnum Dei beatus.
you will not be admitted into the Kingdom of God.

Tuba cum sonuerit dies erit extrema.
When the trumpet sounds doomsday has come.
Et iudex advenerit vocabit sempiterna
The judge appears and call
selectus in patria, prescitos ad inferna.
the chosen to his Kingdom, the damned to Hell.

AD MORTEM FESTINAMUS
PECCARE DESISTAMUS!
WITH DEATH WE DANCE
DON'T WANT TO TRESSPASS ANY MORE!