Weil's work on attention made me look at religion with entirely new eyes. Now I think I have truly only began the work I need to do to maintain clarity of thought while practicing attention.

For all those like me that don't have the necessary expertise to assimilate the original philosophical texts, I would recommend the excellent work done by Stephen West in his podcast Philosophize This. You might need to consume the work from David Hume onwards up until Simone Weil to get a good understanding, if like me you had no previous formal instruction in philosophy, but it's totally worth the effort.