Looking at the Philosophy Talent tree, the path to Ascetic flows from both A Healthy Optimism, and Metaphysics and Mysteries. Does this mean that both of those are requirements for Ascetic, or that either of them is sufficient?
Ascetic has the following requirements that have to be met to allow taking this Talent:
Prerequisite: Healthy Optimism, Metaphysics and Mysteries
So both are necessary. (That is similar to the way The Art of Light Talents are structured in Mutant Chronicles, you have to fulfill all requirements = all the “paths” leading to them.)