Psychological incapacity, a ground to void marriage under Article 36 of the Family Code, is a legal, not a medical, concept. As such, it is enough that parties prove that an enduring part of their personality renders them incapable of performing their essential marital obligations. That the psychological incapacity be rooted in a particular psychological illness is no longer necessary. (Datu vs. Datu G.R. No. 209278 September 15, 2021)