Plotinus (CE 204–270), philosopher, founder of Neoplatonism. He posited an alternative to ex nihilo (out of nothing): ex deo (out of God).
Dionysius the Areopagite was the judge of the Areopagus who, as related in the Acts of the Apostles (Acts 17:34), was converted to Christianity by the preaching of the Apostle Paul. To him was attributed a series of mystical writings, but this is disputed. The reference is likely to the anonymous author of these writings, known as Pseudo-Dionysius. In addition to these teachings he is known for his portrayal of via negativa. Negative theology is an attempt to achieve unity with the Divine Good through discernment, gaining knowledge of what God is not, rather than by describing what God is.
Jakob Böhme (1575–1624), German Christian mystic and theologian, considered an original thinker within the Lutheran tradition. Boehme had a mystical vision, which he incorporated into his theology; he believed that in order to reach God, man must first pass through hell. God exists without time or space, he regenerates himself through eternity.
Eckhart von Hochheim (c1260–c1328), commonly known as Meister Eckhart, German theologian, philosopher, and mystic, belonged to the Dominican Order. One of his sermons on the "highest virtue of disinterest" conforms to the Buddhist concept of detachment and more contemporarily, Kant's "disinterestedness."
Kosti's subjects are all Neoplatonists.