Two FREE books (possibly the free monthly books from Faithlife and Spanish):
"Fresh Eyes on Jesus' Parables: Discovering New Insights in Familiar Passages" by Doug Newton
https://ebooks.faithlife.com/product/148366/fresh-eyes-on-jesus-parables-discovering-new-insights-in-familiar-passages
"¿Se puede perder la salvación?" by R. C. Sproul
https://www.logos.com/product/215584/se-puede-perder-la-salvacion