When they pray, “Let thy kingdom come,” what else do they pray for who are already holy, but that they may persevere in that holiness they now have given unto them? For no otherwise will the kingdom of God come, than as it is certain it will come to those that persevere unto the end.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: De Don. Pers. 2