On Mystical Theology
Short treatise on apophatic theology and the ascent to God through negation, contrasted with the breadth of symbolic theology.
Preface and Praise of Sacred Scripture
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Chapter I: On the Excellence, Necessity, and Fruit of Sacred Scripture
— Cited on mystical theology reaching God by negation, ending in silence
"And again in the book On Mystical Theology, he teaches that spiritual and mystical Theology, which reaches the super-substantial hidden mystery and the darkness of God by transcending all created things through negation, without symbols, is narrow and so compressed as to end in silence"