/summa/FP/FPII/FP_Q4:
Having considered the divine simplicity, we treat next of God's perfection. Now because everything in so far as it is perfect is called good, we shall speak first of the divine perfection; secondly of the divine goodness.
Concerning the first there are three points of inquiry:
(1) Whether God is perfect?
(2) Whether God is perfect universally, as having in Himself the perfections of all things?
(3) Whether creatures can be said to be like God?