Karl Rahner's seemingly inscrutable theology of freedom can be summarized simply: human freedom makes manifest (or fails to make manifest) God's eternal decision to create, to save creation, and thereby to share Godself. Freedom is something real, a substantive freedom for: for saying "yes" to God's merciful self-giving. This freedom most often comes to light not in extraordinary triumphs of spirit, but amid small acts whereby common sinners and downtrodden...