2.51

बाह्याभ्यन्तरविषयाक्षेपी चतुर्थः

bāhyābhyantara-viṣayākṣepī caturthaḥ

The line

The fourth goes beyond the range of external and internal.

नेपालीमा

चौथो बाहिरी र भित्रीको सीमा नाघ्छ।

Where it sits

2.50 gave three operations. This is a fourth, and the next line says what follows from it. The fruit is the dwindling of the covering over the light.

Split: bāhya (बाह्य) + ābhyantara (आभ्यन्तर) + viṣaya (विषय) + ākṣepī (आक्षेपी) + caturthaḥ (चतुर्थः)

Sanskrit, in depth

The words

WordGrammarSense
bāhya (बाह्य)stemexternal.
ābhyantara (आभ्यन्तर)steminternal.
viṣaya (विषय)stemthe range, the object.
ākṣepī (आक्षेपी)nominative singular of ākṣepin (आक्षेपिन्)throwing beyond, going past that range.
caturthaḥ (चतुर्थः)nominative singular, masculinethe fourth. A fourth prāṇāyāma (प्राणायाम).

The phrases

The fourth goes beyond the range of external and internal. viṣaya (विषय) + ākṣepa (आक्षेप) is a (अ) + ā (आ) = ā (आ). ākṣepī (आक्षेपी) is the nominative of a stem in -in (इन्). caturthaḥ (चतुर्थः) agrees with prāṇāyāmaḥ (प्राणायामः), still in force. Suspension was the third operation. This fourth is not a longer hold. It is past the domain of in and out.

Sanskrit in this line

A stem in -in (इन्), nominative -ī (ई), which you can now treat as familiar. caturtha (चतुर्थ) is the ordinal “fourth.” Ordinals behave as adjectives and agree. Here it is masculine nominative, matching prāṇāyāmaḥ (प्राणायामः).

Say it back

Say what the fourth is beyond. External and internal, not “effort.”

Next

2.52. Then the covering over the light dwindles.