The Vedanta Sutras, commentary by Sankaracharya (SBE34), tr. by George Thibaut  at sacred-texts.com
18. And on account of desire (being mentioned as belonging to the ânandamaya) no regard is to be had to what is inferred, (i.e. to the pradhâna inferred by the Sânkhyas.)
Since in the passage 'he desired, may I be many, may I grow forth,' which occurs in the chapter treating of the ânandamaya (Taitt. Up. II, 6), the quality of feeling desire is mentioned, that which is inferred, i.e. the non-intelligent pradhâna assumed by the Sânkhyas, cannot be regarded as being the Self consisting of bliss and the cause of the world. Although the opinion that the pradhâna is the
cause of the world, has already been refuted in the Sûtra I, 1, 5, it is here, where a favourable opportunity presents itself, refuted for a second time on the basis of the scriptural passage about the cause of the world feeling desire, for the purpose of showing the uniformity of view (of all scriptural passages).