The Servants of God are reminded of Augustine’s phrase, “The end of man is to love God and enjoy Him forever.”
In the center of the window is the elevated chalice and paten (Holy Communion, Christian Worship) providing the heavenly sustenance from which Grace flows. Man is saved by Grace not works, and Grace without works is dead.
The bold arrow points to the twelve disciples reminding us we are not saints by nature. It shows us the potential of every man to strive for sainthood which is to be realized through the Church.