ताँ हैतामेके सावित्रीमनुष्टुभमन्वा-हुर्वागनुष्टुबेतद्वाचमनुब्रूम इति न तथाकुर्याद्गायत्रीमेव सावित्रीमनुब्रूयाद्यदि हवा अप्येवंविद्वह्विव प्रतिगृह्णाति न हैवतद्गायत्र्या एकंचन पदं प्रति ॥ ५ ॥
In plain words
Some teachers recite the Sāvitrī to their pupils as if it were simply the Anuṣṭubh metre — reasoning that speech is Anuṣṭubh, so reciting it is only reciting speech. Don't do that. Recite the Gāyatrī as exactly what she is: the Sāvitrī herself. Because a person who truly knows her could be handed what looks like a fortune, and it wouldn't add up to even one of her four feet.
Close to the Sanskrit
That [Sāvitrī], some [teachers] recite to the pupil as the Anuṣṭubh metre: 'Speech is Anuṣṭubh; this speech we recite.' One should not do so; rather, one should recite the Gāyatrī itself as the Sāvitrī. If, indeed, such a knower should even accept what looks like much [as a gift], that gift is indeed not equal even to a single foot of the Gāyatrī.