Man and Sin by Piet Schoonenberg (1964) 1.5F1

Summary of text [comment] page 29

St. Thomas Aquinas also claimed that angels and the first couple (Adam and Eve) were unable to commit mortal sins because they were granted immunity from concupiscence.

[Schoonenberg showed great courage in raising a topic that calls forth derision by Modern Genius.  Allow me to follow the fool.

First consider the angels.  For angels, the vertical axis of the intersecting nested forms might parallel the human axis.  The horizontal axis must differ in that lawessential and dispositions must be very different in a purely spiritual realm than in the human realm.

Even though we cannot know what those differences are, we can explore models through art.]