What did St. Thomas Aquinas write about Christ's passion? St. Thomas Aquinas never wrote a complete treatise devoted solely to Christ's passion. So what did St. Thomas Aquinas have to say about Christ's passion?
This contains a collection of excerpts from St. Thomas's works (e.g., his Summa, quodlibetal questions, and commentaries on the Gospels) that pertain to the passion:

Meditations for Lent from St. Thomas Aquinas (audiobook)