गोविन्द भाष्य (श्रील बलदेव विद्याभूषण - अचिन्त्यभेदाभेद वेदान्त ब्रह्मसूत्र भाष्य सटीक)

The word "tu" (but) is used here to dispel doubt. Performed before
transcendental knowledge is manifested, the daily agnihotra-yajña and other nitya-
karmas have the manifestation of transcendental as their karmic reaction. Why is
that? The sūtra explains, "tad-darśanāt" (for that is the revelation). In the Bṛhad-
āraṇyaka Upaniṣad (4.4.22) it is said:
tam etaṁ vedānuvacanena
"By studying the Vedas they come to understand the Supreme Personality of
Godhead."
This means that transcendental knowledge (is the karmic result of nitya-
karmas, such as study of the Vedas). Transcendental knowledge, then, destroys all
past pious karmic reactions except for those of nitya-karma duties, such as the
performance of daily agnihotra-yajñas. That is the meaning of the sūtra.
Transcendental knowledge does not destroy the karmic reactions of nitya-
karma duties for the attainment of transcendental knowledge is itself the karmic
reaction these duties produce. When a house is set afire some seeds within it may
become heated but not destroyed. Such grains can never be sown, for they will
never sprout into plants. In the same way the reactions to nitya-karma activities
are not destroyed (although they will not sprout into future material bondage). In
the Bṛhad-āraṇyaka Upaniṣad it is said:
karmaṇā pitṛlokaḥ
"By performing nitya-karma duties one goes to Pitṛloka."
This shows that sometimes nitya-karma duties bring the attainment of
Svargaloka as their karmic reaction. These reactions all become destroyed.
Adhikaraṇa 13
Some Fine Points of Karmic Reactions
Introduction by Śrīla Baladeva Vidyābhūṣaṇa
It has been shown that by the Lord's will the ārabdha-phala pious and sinful
karmic reactions of they who are enlightened with transcendental knowledge
remain and are not destroyed. The Lord does this so the enlightened souls may