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

Pūrvapakṣa (the opponent speaks): The Śruti-śāstra explains:
ātmety evopāsīta
"One should worship the Supreme Lord."
That is how one should meditate on the Lord. One should not meditate on Him
as one's father or in these other ways.
Siddhānta (conclusion): In the following words the author of the sūtras gives
His conclusion.
Sūtra 19
kāryākhyānād apūrvam
kārya—result; ākhyānāt—because of the statement; a—like; pūrvam—what was
before.
Because of the description of the result it is like the former.
Purport by Śrīla Baladeva Vidyābhūṣaṇa
Here the word "pūrva" means "the previous qualities, such as being full of
bliss". The word “apūrva" means "the qualities, such as being the father, that are
like these previous qualities". The devotees should meditate on these qualities.
Why? The sūtra explains: "kāryākhyānād" (Because of the description of the
result). The result here is the result attained by worshiping the Lord with love.
This is explained in Śvetāśvatara Upaniṣad (5.14):
bhāva-grahyam anīḍākhyam
"The spiritual Supreme Personality of Godhead is attained only by love."
The Supreme Personality of Godhead Himself declares (Śrīmad-Bhāgavatam
3.25.38):
yeṣām ahaṁ priya ātmā sutaś ca