योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-72, verse-26

न कूलकाष्ठैर्जलधिर्न रजोभिर्नभस्तलम् ।
न म्लायति निजैर्लोकव्यवहारैरिहात्मवान् ॥ २६ ॥

na kūlakāṣṭhairjaladhirna rajobhirnabhastalam ,
na mlāyati nijairlokavyavahārairihātmavān 26

26. na kūlakāṣṭhaiḥ jaladhiḥ na rajobhiḥ nabhastalam
na mlāyati nijaiḥ lokavyavahāraiḥ iha ātmanvān

26. yathā jaladhiḥ kūlakāṣṭhaiḥ na
(mlāyati) nabhastalam ca rajobhiḥ
na (mlāyati) tathā iha ātmanvān
nijaiḥ lokavyavahāraiḥ na mlāyati

26. The ocean is not defiled by the logs from the shore, nor is the sky by dust. Similarly, the self-possessed person (ātman) in this world is not sullied by their own worldly activities.

Words meanings summery:

• न (na) - not (not; nor)

• कूलकाष्ठैः (kūlakāṣṭhaiḥ) - by the logs from the shore (by logs from the shore; by driftwood)

• जलधिः (jaladhiḥ) - the ocean (ocean; sea)

• न (na) - nor (not; nor)

• रजोभिः (rajobhiḥ) - by dust (by dust; with particles of dust)

• नभस्तलम् (nabhastalam) - the sky (sky; atmosphere; space)

• न (na) - not (not; nor)

• म्लायति (mlāyati) - is sullied; is defiled (withers; fades; is sullied; is defiled)

• निजैः (nijaiḥ) - by their own (by one's own; by intrinsic)

• लोकव्यवहारैः (lokavyavahāraiḥ) - by worldly activities (by worldly activities/dealings)

• इह (iha) - in this world (here; in this world)

• आत्मन्वान् (ātmanvān) - the self-possessed person (ātman) (possessing a self; self-possessed; spiritual)

Words meanings and morphology

न (na) - not (not; nor)

(indeclinable)

कूलकाष्ठैः (kūlakāṣṭhaiḥ) - by the logs from the shore (by logs from the shore; by driftwood)

(noun)

Instrumental, neuter, plural of kūlakāṣṭha

kūlakāṣṭha - driftwood; logs from the shore

Compound type : ṣaṣṭhī-tatpuruṣa (kūla+kāṣṭha)

• kūla – bank; shore; edge
  noun (neuter)
• kāṣṭha – piece of wood; log; timber
  noun (neuter)

Note: Means by which defilement might occur.

जलधिः (jaladhiḥ) - the ocean (ocean; sea)

(noun)

Nominative, masculine, singular of jaladhi

jaladhi - ocean; sea (lit. "water-holder")

Compound of jala (water) and dhi (holder, from √dhā).

Compound type : upapada-tatpuruṣa (jala+dhi)

• jala – water
  noun (neuter)
• dhi – holder; container; receptacle
  noun (masculine)
  From √dhā (to place, hold) with i suffix.
  Root: dhā (class 3)

Note: Subject of the first comparison clause.

न (na) - nor (not; nor)

(indeclinable)

रजोभिः (rajobhiḥ) - by dust (by dust; with particles of dust)

(noun)

Instrumental, neuter, plural of rajas

rajas - dust; pollen; impurity; passion

Root: rañj (class 1)

Note: Means by which defilement might occur for the sky.

नभस्तलम् (nabhastalam) - the sky (sky; atmosphere; space)

(noun)

Nominative, neuter, singular of nabhastala

nabhastala - sky; firmament; celestial region

Compound of nabhas (sky) and tala (surface, region).

Compound type : ṣaṣṭhī-tatpuruṣa (nabhas+tala)

• nabhas – sky; atmosphere; cloud
  noun (neuter)
• tala – surface; level; plane; region
  noun (neuter)

Note: Subject of the second comparison clause.

न (na) - not (not; nor)

(indeclinable)

म्लायति (mlāyati) - is sullied; is defiled (withers; fades; is sullied; is defiled)

(verb)

3rd person , singular, active, present (lat) of mlai

√mlai or √mlā (to wither). mlāyati is from class 1.

Root: mlai (class 1)

Note: Applies to jaladhiḥ, nabhastalam, and ātmanvān.

निजैः (nijaiḥ) - by their own (by one's own; by intrinsic)

(adjective)

Instrumental, masculine, plural of nija

nija - one's own; inherent; proper

लोकव्यवहारैः (lokavyavahāraiḥ) - by worldly activities (by worldly activities/dealings)

(noun)

Instrumental, masculine, plural of lokavyavahāra

lokavyavahāra - worldly conduct/activity/custom

Compound type : ṣaṣṭhī-tatpuruṣa (loka+vyavahāra)

• loka – world; people; realm
  noun (masculine)
  From √lok (to see).
  Root: lok (class 1)
• vyavahāra – conduct; dealing; activity; usage; practice
  noun (masculine)
  From √hṛ (to take) with vi- and ava-.
  Prefixes: vi+ava
  Root: hṛ (class 1)

Note: Means by which the self-possessed person might be affected.

इह (iha) - in this world (here; in this world)

(indeclinable)

आत्मन्वान् (ātmanvān) - the self-possessed person (ātman) (possessing a self; self-possessed; spiritual)

(adjective)

Nominative, masculine, singular of ātmanvat

ātmanvat - possessing a self; spiritual; intelligent; self-possessed

Derived from ātman with the possessive suffix vat.

Note: The primary subject of the main clause. ātman is a specific instruction for bracketing.