On the Lord's Prayer 34

In celebrating prayers, we find that the three youths, with Daniel, strong in faith and victorious in captivity, observed the third, sixth, and ninth hours, as a sacrament, of course, of the Trinity, which was to be made manifest in the last times. For the first hour, coming to the third, shows the completed number of the Trinity; and likewise the fourth, proceeding to the sixth, declares a second trinity; and when from the seventh the ninth is completed, a perfect trinity is counted by threes of hours. The worshippers of God, determining these spaces of hours spiritually long ago, kept to them as fixed and lawful times for prayer. And it was afterwards made manifest that these were sacraments of old, because the righteous prayed so before. For at the third hour the Holy Spirit descended upon the disciples, fulfilling the grace of the Lord's promise. Likewise Peter, going up to the housetop at the sixth hour, was instructed by the sign and also by the voice of God admonishing him, to admit all to the grace of salvation, when before he had doubted about cleansing the gentiles. And the Lord, crucified at the sixth hour, at the ninth washed away our sins with his blood, and, that he might redeem and give us life, he then accomplished his victory by his passion.