John of Damascus quotes:

The day of the Nativity of the Mother of God is a day of universal joy, because through the Mother of God, the entire human race was renewed, and the sorrow of the first mother, Eve, was transformed into joy.

To serve Mary and to be her courtier is the greatest honor we can possibly possess; for to serve the Queen of Heaven is already to reign there; and to live under her command is more than to govern.

The saints must be honored as friends of Christ and children and heirs of God. Let us carefully observe the manner of life of all the apostles, martyrs, ascetics, and just men who announced the coming of the Lord. And let us emulate their faith, charity, hope, zeal, life, patience under suffering, and perseverance unto death so that we may also share their crowns of glory.

Christ the Lord is risen. Our joy that hath no end.

He who does not believe according to the tradition of the Catholic Church is an unbeliever.

Angels are intelligent reflections of light, that original light which has no beginning. They can illuminate. They do not need tongues or ears, for they can communicate without speech, in thought.

Both angels and demons are ignorant of the future, yet they make predictions. The angels do so when God reveals the future to them and commands them to prophesy, and what they prophesy comes to pass. Demons also make predictions, but these are only guesses based on what they see from afar.

I do not worship matter; I worship the Creator of matter who became matter for my sake.

Gluttony should be destroyed by self-control; unchastity by desire for God and longing for the blessings held in store; avarice by compassion for the poor; anger by goodwill and love for all men; worldly dejection by spiritual joy; listlessness by patience, perseverance and offering thanks to God; self-esteem by doing good in secret and by praying constantly with a contrite heart; and pride by not judging or despising anyone in the manner of the boastful Pharisee (cf. Lk. 18:11-12), and by considering oneself the least of all men.

The Eucharist is a fire which inflames us

And all that is therein; Invisible and visible, Their notes let all things blend, For Christ the Lord is risen. Our joy that hath no end.

All we know if an angel is that it is incorporeal, immaterial, and only by comparing it with God-who is incomparable-can we see that it has some density and body after all, since in reality only God is truly immaterial and incorporeal.

Our Lord humbled without humiliation His lofty station which yet could not be humbled, and condescends to His servants, with a condescension ineffable and incomprehensible. God being perfect becomes perfect man, and brings to perfection the newest of all new things (cf. Eccles 1:10), the only new thing under the sun, through which the boundless might of God is manifested. For what greater thing is there than that God should become man?

Every man possesses that which is according to the image of God, for the gifts of God are irrevocable (Rom. 11:29). But only a few ? those who are virtuous and holy, and have imitated the goodness of God to the limit of human powers ? possess that which is according to the likeness of God.

Think of the Father as a spring of life begetting the Son like a river and the Holy Ghost like a sea, for the spring and the river and sea are all one nature. Think of the Father as a root, and of the Son as a branch, and the Spirit as a fruit, for the substance in these three is one. The Father is a sun with the Son as rays and the Holy Ghost as heat.

In former times, God, who is without form or body, could never be depicted. But now when God is seen in the flesh conversing with men, I make an image of the God whom I see. I do not worship matter; I worship the Creator of matter who became matter for my sake.

The whole earth is a living icon of the face of God.

Now all things have been filled with light, both heaven and earth and those beneath the earth; so let all creation sing Christ's rising, by which it is established.

If a pagan asks you to show him your faith, take him into church and place him before the icons.

I do not worship matter, I worship the God of matter, who became matter for my sake and deigned to inhabit matter, who worked out my salvation through matter. I will not cease from honoring that matter which works for my salvation. I venerate it, though not as God.

O Mother of God! If I place my confidence in thee, I shall be saved; if I am under thy protection, I have nothing to fear; for the fact of being thy client is a possession of a certainty of salvation which God grants only to those whom He intends to save.

If the Word of God is living and powerful, and if the Lord does all things whatsoever he wills; if he said, "Let there be light", and it happened; if he said, "let there be a firmament", and it happened; ...if finally the Word of God himself willingly became man and made flesh for himself out of the most pure and undefiled blood of the holy and ever Virgin, why should he not be capable of making bread his Body and wine and water his Blood?... God said, "This is my Body", and "This is my Blood."

Woman is the daughter of falsehood, a sentinel of hell, the enemy of peace.

Because the one who by excellency of nature transcends all quantity and size and magnitude...has now...contracted himself into a quantity and size and has acquired a physical identity, do not hesitate any longer to draw pictures and to set forth, for all to see, him who has chosen to let himself be seen.

Water is also one of the four elements, the most beautiful of God's creations. It is both wet and cold, heavy, and with a tendency to descend, and flows with great readiness. It is this the Holy Scripture has in view when it says, "And the darkness was upon the face of the deep. And the Spirit of God moved upon the face of the waters." Water, then, is the most beautiful element and rich in usefulness, and purifies from all filth, and not only from the filth of the body but from that of the soul, if it should have received the grace of the Spirit.

...we shall incur no slight injury, but rather great danger, if we rashly yield ourselves to the inclinations of men who aim at exciting strife and tumults, so as to draw us away from what is good? Let us cleave, therefore, to those who cultivate peace with godliness?

Because of the Incarnation, I salute all remaining matter with reverence.

Christ sits in the body at the right hand of God the Father, but we do not hold that the right hand of the Father is actual place. For how could He that is uncircumscribed have a right hand limited by place? But we understand the right hand of the Father to be the glory and honor of the Godhead in which the Son of God, Who existed as God before the ages, and is of like essence to the Father, and in the end became flesh, has a seat in the body, His flesh sharing in the glory. For He along with His flesh is adored with one adoration by all creation.

An angel is an intelligent essence, always in motion. It has free will, is incorporeal, serves God, and has been bestowed with immortality. Only the Creator understands its true nature.

The whole earth is a living icon of the face of God. ... I do not worship matter. I worship the Creator of matter who became matter for my sake, who willed to take His abode in matter, who worked out my salvation through matter. Never will I cease honoring the matter which wrought my salvation! I honor it, but not as God. Because of this I salute all remaining matter with reverence, because God has filled it with his grace and power. Through it my salvation has come to me.

All who ask receive, those who seek find, and to those who knock it shall be opened. Therefore, let us knock at the beautiful garden of Scripture. It is fragrant, sweet, and blooming with various sounds of spiritual and divinely inspired birds. They sing all around our ears, capture our hearts, comfort the mourners, pacify the angry, and fill us with everlasting joy.

How can this come about?" Mary asked. "The Holy Spirit will come upon you," the angel answered, "and the power of the Most High will cover you with its shadow." And now you are the one who puts the question: "How can bread become Christ and wine His Blood?" I answer: "The power of the Holy Spirit will be at work to give us a marvel which surpasses understanding.

Devotion to you, O Blessed Virgin, is a means of salvation which God gives to those whom he wishes to save.