The Vedanta Sutras, commentary by Sankaracharya (SBE34), tr. by George Thibaut [1890] at sacred-texts.com

14. And because he is declared to be the cause of it, (i.e. of bliss; therefore maya is to be taken as denoting abundance.)

Maya must be understood to denote abundance, for that reason also that Scripture declares Brahman to be the cause of bliss, 'For he alone causes bliss' (Taitt. Up. II, 7). For he who causes bliss must himself abound in bliss; just as we infer in ordinary life, that a man who enriches others must himself possess abundant wealth. As, therefore, maya may be taken to mean 'abundant,' the Self consisting of bliss is the highest Self.