Summa Theologiae by St Thomas Aquinas
FP: Treatise On Man
Q88 How The Human Soul Knows What Is Above Itself
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We must now consider how the human soul knows what is above itself, viz. immaterial substances. Under this head there are three points of inquiry:

A1 Whether the human soul in the present state of life can understand the immaterial substances called angels, in themselves?

A2 Whether it can arrive at the knowledge thereof by the knowledge of material things?

A3 Whether God is the first object of our knowledge?