I haven't read one that hasn't moved, inspired or corrected/deepened my understanding and faith.
Those I've read most of and about include Maximus the Confessor, Gregory of Nazianzen, Gregory of Nyssa, Cyril of Alexandria, Irenaeus of Lyon, Athanasius and Augustine.
Now the one thing truly blessed is the Divinity Itself. Whatever else we may suppose It to be, this pure life, the ineffable and incomprehensible good, is beatitude. It is beatitude, this inexpressible beauty which is very grace, wisdom, and power; this true light that is the fount of all goodness, mighty above all else; the one thing loveable which is always the same, rejoicing without end in infinite happiness. Even if one has said about It all one can, yet one has said nothing worthy of It. For the mind cannot reach that which IS; even if we continue to think ever more sublime thoughts about It, yet no word can express what is meant.
But as He who fashioned man made him in the image of God; in a derived sense that which is called by this name should also be held blessed, inasmuch as he participates in the true beatitude.
St Gregory of Nyssa The Beatitudes Sermon 1 [Ancient Christian Writers, 1956 Graef, Hilda C. trans. p. 87-88]