St. Peter Canisius: “There is no work more commended in Holy Scripture, none… more necessarily is to be exercised in this life than prayer. The prayer of him that humbles himself shall pierce the clouds [Sirach 35:21]. Also, it behooves us always to pray [Luke 18:1], namely, with a zealous disposition of heart, and without hypocrisy or respect for the praise of men, that is to say, in spirit and truth.” (Summa Doctrinae Christianae, 16th century)
St. Irenaeus, Against Heresies, Book 3, Chap. 3, A.D. 180: “Since, however, it would be very tedious in such a volume as this, to reckon up the successions of all the Churches, we do put to confusion all those who… assemble in unauthorized meetings; [we do this, I say] by indicating that tradition derived from the apostles, of the very great, the very ancient, and universally known Church founded and organized at Rome by the two most glorious apostles, Peter and Paul; as also [by pointing] out the faith preached to men, which comes down to our time by means of the successions of the bishops. For it is a matter of necessity that every Church should agree with this Church [i.e. of Rome], on account of its preeminent authority, that is, the faithful everywhere...”
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