Many modern day academics enjoy setting St. Peter and St. Paul in enmity with one another; however, the over emphasis of Galatians 2:11-14 by modern scholarship fails to acknowledge that even though they had a disagreement their mission of spreading the Gospel was the same.
“If it is impossible to separate what God has united, it is also certain that you cannot find Jesus except with Mary and through Mary.” - St. Pius X
"Our apostles also knew, through our Lord Jesus Christ, that there would be strife on account of the office of the episcopate. For this reason, therefore... they appointed those [ministers] already mentioned, and afterwards gave instructions, that when these should fall asleep, other approved men should succeed them in their ministry."
"He [Satan] has invented heresies and schisms, whereby he might subvert the faith, might corrupt the truth, might divide the unity."
8 quotes by various Popes explaining the power and necessity of the Rosary in the Catholic life.
"The universal Church of the faithful is one outside of which none is saved."
Pope Innocent III, ex cathedra, Fourth Lateran Council (1215 AD)
"We call the right by which St. Peter or his successor has always been the head of the Church, and of all its bishops, the Primacy of St. Peter or of the Pope. Primacy means holding first place."
"There are two powers, august Emperor, by which this world is chiefly ruled, namely, the sacred authority of the priests and the royal power."
"Unless boys are steeped from the beginning in the best books, their minds will be ruined and they will not be able to acquire good judgment." - Pope Pius II
"A man can derive more profit from his books in one year than from a lifetime spent in pondering the philosophy of others” (Consistorial address of 1318). - Pope John XXII
Encroaching Islam, the need for a unified Roman liturgy, and the Catholic faithful being led astray by heretics are all traits the current time shares with the time of St. Pope Pius V's pontificate.