Saint Ignatius of Loyola

Do not let any occasion of gaining merit pass without taking care to draw some spiritual profit from it; as, for example, from a sharp word which someone may say to you; from an act of obedience imposed against your will; from an opportunity which may occur to humble yourself, or to practice charity, sweetness, and patience. All of these occasions are gain for you, and you should seek to procure them; and at the close of that day, when the greatest number of them have come to you, you should go to rest most cheerful and pleased, as the merchant does on the day when he had had most chance for making money; for on that day business has prospered with him. 

-- Saint Ignatius of  Loyola

Saint Peter Chrysologus

Anyone who wishes to frolic with the devil cannot rejoice with Christ. 

-- Saint Peter Chrysologus

Saint Augustine of Hippo

No one of you should say, "Blessed are they who have deserved to receive Christ into their homes!" Do not grieve or complain that you were born in a time when you can no longer see God in the flesh. He did not in fact take this privilege from you. As he says, "Whatever you have done to the least of my brothers, you did to me." 

-- Saint Augustine of Hippo

Saint Boniface

Let us continue the fight on the day of the Lord. The days of anguish and of tribulation have overtaken us; if God so wills, "let us die for the holy laws of our fathers," so that we may deserve to obtain an eternal inheritance with them. 

-- Saint Boniface

Blessed Maria of the Passion of Our Lord Jesus Christ

I want to be holy, loving Jesus in the Eucharist, suffering with Christ Crucified and seeing Christ in my brothers and sisters. 

-- Blessed Maria of the Passion of Our Lord Jesus Christ

Saint John Damascene

Joachim and Anne, how blessed a couple! All creation is indebted to you. For at your hands the Creator was offered a gift excelling all other gifts: a chaste mother, who alone was worthy of him. Joachim and Anne, how blessed and spotless a couple! You will be known by the fruit you have borne, as the Lord says: “By their fruits you will know them.” The conduct of your life pleased God and was worthy of your daughter. For by the chaste and holy life you led together, you have fashioned a jewel of virginity: she who remained a virgin before, during, and after giving birth. She alone for all time would maintain her virginity in mind and soul as well as in body. Joachim and Anne, how chaste a couple! While leading a devout and holy life in your human nature, you gave birth to a daughter nobler than the angels, whose queen she now is. 

-- Saint John Damascene from a sermon

Saint Gregory of Nyssa

Christian perfection has but one limit, that of having none. 

-- Saint Gregory of Nyssa