On the TrinityAugustine
About On the Trinity
is Augustine's longest and most philosophically ambitious doctrinal work, composed over nearly twenty years. Its subject is the Christian doctrine that God is one substance in three persons, but its method is as much introspective as theological: Augustine searches for the image of the Trinity in the human mind.
The early books defend the doctrine against objections and clarify the divine missions of the Son and the Spirit as revealed in Scripture. The middle books turn to the crucial problem: how can God be both one and three without contradiction? Augustine argues that the divine persons are distinguished by their relations (the Father begets, the Son is begotten, the Spirit proceeds) while remaining one in substance. Relation, not substance, accounts for the plurality.
The later books undertake the most original part of the project. If human beings are made in the image of God, then some trace of the Trinity should be discoverable in the mind. Augustine examines a series of mental triads: memory, understanding, and will; the mind knowing itself; the mind loving itself. The deepest image of the Trinity is the mind's simultaneous act of remembering, understanding, and loving God. transforms the doctrine from a purely dogmatic formula into a philosophical exploration of self-knowledge, interiority, and the structure of consciousness itself.