First Part (Prima Pars) — Question 54

• Article 1 — Whether an Angel's Act of Understanding Is His Substance?
• Article 2 — Whether in the Angel to Understand Is to Exist?
• Article 3 — Whether an Angel's Power of Intelligence Is His Essence?
• Article 4 — Whether There Is an Active and a Passive Intellect in an Angel?
• Article 5 — Whether There Is Only Intellectual Knowledge in the Angels?