Saint Maximus the Confessor

The extremities of the earth, and all in every part of it who purely and rightly confess the Lord look directly towards the most holy Roman Church and its confession and faith, as it were to a sun of unfailing light, awaiting from it the bright radiance of the sacred dogmas of our Fathers according to what the six inspired and holy councils have purely and piously decreed, declaring most expressly the symbol of faith. For from the coming down of the incarnate Word amongst us, all the Churches in every part of the world have held that greatest Church alone as their base and foundation, seeing that according to the promise of Christ our Saviour, the gates of hell do never prevail against it, that it has the keys of a right confession and faith in Him, that it opens the true and only religion to such as approach with piety, and shuts up and locks every heretical mouth that speaks injustice against the Most High. 

-- Saint Maximus the Confessor

Saint Irenaeus of Lyons

When the Lord told his disciples to go and teach all nations and baptize them in the name of the Father and of the Son and of the Holy Spirit, he conferred on them the power of giving men new life in God.

He had promised through the prophets that in these last days he would pour out his Spirit on his servants and handmaids, and that they would prophesy. So when the Son of God became the Son of Man, the Spirit also descended upon him, becoming accustomed in this way to dwelling with the human race, to living in men and to inhabiting God’s creation. The Spirit accomplished the Father’s will in men who had grown old in sin, and gave them new life in Christ.

-- Saint Irenaeus of Lyons from his book "Against Heresies"

Saint Philip Neri

It is an old custom with the servants of God always to have some little prayers ready and to be darting them up to heaven frequently during the day, lifting their minds to God out of the filth of this world. He who adopts this plan will get great fruit with little pains.

-- Saint Philip Neri

Pope Saint Gregory VII

Now, my dearest brothers, listen carefully to what I tell you. All those throughout the world who are numbered as Christian and who truly acknowledge the Christian faith know and believe that the blessed Peter, the prince of the apostles, is the father of all Christians and, after Christ, the first shepherd, and that the holy Roman Church is the mother and teacher of all the churches. Therefore, if you believe this and hold to it without hesitation, I ask you and enjoin upon you by Almighty God – I your brother and unworthy teacher as I am – to support and assist your father and your mother if you wish to have, through them, the remission of all your sins, along with blessings and grace in this world and in the life to come. May almighty God, from whom all good things come, continually enlighten your minds and fill them with love for him and for your neighbor, so that by your devotion you may deserve to make this father and mother of whom I have spoken your debtors and enter without shame into their company. Amen.

-- Pope Saint Gregory VII from a letter

Saint John Bosco

Do you want our Lord to give you many graces? Visit him often. Do you want him to give you few graces? Visit him seldom. Visits to the Blessed Sacrament are powerful and indispensable means of overcoming the attacks of the devil. Make frequent visits to Jesus in the Blessed Sacrament and the devil will be powerless against you. 

-- Saint John Bosco 

Saint Elizabeth Ann Seton

I will go peaceably and firmly to the Catholic Church for if Faith is so important to our salvation, I will seek it where the true Faith first began, seek it among those who received it from God himself.

-- Saint Elizabeth Ann Seton

Saint Therese of Lisieux

You know well enough that Our Lord does not look so much at the greatness of our actions, nor even at their difficulty, but at the love with which we do them. 

-- Saint Therese of Lisieux