The title itself is literal: You keep a journal. Your choices write the pages. Every saint has a past; every sinner has a future.
Since this is likely an indie project hosted on a creator-supported platform, the most "helpful" story details will be found in the developer's official changelogs. You can check the following for the latest v10 narrative updates: Official Page Salr Games itch.io profile usually lists the most recent devlogs and version notes. Community Forums journal of a saint v10 by salr games new