Saint John Bosco

Let us regard those boys over whom we have some authority as our own sons. Let us place ourselves in their service. Let us be ashamed to assume an attitude of superiority. Let us not rule over them except for the purpose of serving them better. 

This was the method that Jesus used with the apostles. He put up with their ignorance and roughness and even their infidelity. He treated sinners with a kindness and affection that caused some to be shocked, others to be scandalized and still others to hope for God's mercy. And so he bade us to be gentle and humble of heart. 

-- Saint John Bosco from a letter

Saint Irenaeus of Lyons

Being obedient she became the cause of salvation for herself and for the whole human race.

-- Saint Irenaeus of Lyons

Pope Saint Pius X

Truly we are passing through disastrous times, when we may well make our own the lamentation of the Prophet: "There is no truth, and there is no mercy, and there is no knowledge of God in the land" (Hosea 4:1). Yet in the midst of this tide of evil, the Virgin Most Merciful rises before our eyes like a rainbow, as the arbiter of peace between God and man. 

-- Pope Saint Pius X

Saint Thomas Aquinas

Hence we must say that for the knowledge of any truth whatsoever man needs divine help, that the intellect may be moved by God to its act. But he does not need a new light added to his natural light, in order to know the truth in all things, but only in some that surpasses his natural knowledge. 

-- Saint Thomas Aquinas

Saint Cyril of Jerusalem

Since Christ Himself has said, "This is My Body" who shall dare to doubt that It is His Body?

-- Saint Cyril of Jerusalem

Saint Mary Mazarello

Make up your mind to become a saint.

-- Saint Mary Mazarello

Saint Ignatius of Antioch

Mary's virginity and giving birth, and even the Lord's death escaped the notice of the prince of this world; these three mysteries worthy of proclamation were accomplished in God's silence.

-- Saint Ignatius of Antioch