The Vedanta Sutras of Badarayana, Commentary by Sankara (SBE38), tr. by George Thibaut  at sacred-texts.com
12. Of him who has merely read the Veda (there is qualification for works).
As the clause, 'Having learnt (read) the Veda from a family of teachers,' speaks only of the reading, we determine that acts are there enjoined for him who has only read the Veda.--But from this it would follow that on account of being destitute of knowledge such a person would not be qualified for works!--Never mind; we do not mean to deny that the understanding of sacrificial acts which springs from the reading of the texts is the cause of qualification for their performance; we only wish to establish that the knowledge of the Self derived from the Upanishads is seen to have an independent purpose of its own and therefore does not supply a reason of qualification for acts. Analogously a person who is qualified for one act does not require the knowledge of another act.
Against the reasoning of Sûtra 7 we make the following remark.