The XXVth and Last Sunday after Pentecost (XXIVth after Trinity)
Today is the Tentyfifth and last Sunday after Pentecost. Advent begins next week!
The Collect from the Roman Breviary:
Arouse, we beseech thee, O Lord, the wills of thy faithful, that, by more earnestly following after the fruit of the divine work, they may the more abundantly partake of thy mercies. Through.
The Propers of today's Mass in a pdf file from the SSPX (UK) website.