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.
John of DamascusHow 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.
John of DamascusThink 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.
John of DamascusO 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.
John of DamascusChrist 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.
John of Damascus