I, 4, 7

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

7. And (the case of the term avyakta) is like that of the term mahat.

While the Sânkhyas employ the term 'the Great one,' to denote the first-born entity, which is mere existence 1(? viz. the intellect), the term has a different meaning in Vedic use. This we see from its being connected with the Self, &c. in such passages as the following, 'The great Self is beyond the Intellect' (Ka. Up. I, 3, 10); 'The great omnipresent Self (Ka. Up. I, 2, 23); 'I know that great person' (Sve. Up. III, 8). We thence conclude that the word avyakta also, where it occurs in the Veda, cannot denote the pradhâna.--The pradhâna is therefore a mere thing of inference, and not vouched for by Scripture.