1.3.38 वृत्तिसर्गतायनेषु क्रमः

Word by word (padaccheda)

Right context वृत्ति- सर्ग- तायनेषु saptamī · bahuvacanaLeft context क्रमः pañcamī · ekavacana

Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").
Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.

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Full reading

वृत्ति-सर्ग-तायनेषु क्रमः

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

After the verb क्रम् 'to move', when used in the senses of 'continuity', 'energy' and 'development', the आत्मनेपद is used.
The word 'kram' governs the succeeding sutras up to 1.3.43 and is understood in them all.

The verb kram by sutra 1.3.78 (after the rest, let the parasmaipada affixes be employed in marking the agent), would have taken the affixes of the parasmaipada; the present aphorism enjoins Atmanepada affixes in certain cases when the verb means to have a taste for &c.

Vritti 'continuity' means unobstructed, or want of interruption (i. e., a taste for, or facility in, anything), sarga 'energy' means application, resolution and determination. Tayana 'development' means increase and growth.

As (1) ऋक्ष्वस्य क्रमते बुद्धिः - 'his reason proceeds unobstructed through the Rig. scriptures i. e., he can easily comprehend the Rig.' (2). व्याकरणाध्ययनाय क्रमते 'the pupil shows energy or exerts to study the grammar.' (3). अस्मिनशास्त्राणि क्रमन्ते 'the shastras are developed in him.'

Why in these senses only? Witness अपक्रामति 'he runs away.'

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.