योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-44, verse-13

मृदुभिः सत्क्रियाकुन्तैर्विवेकार्कातपैरपि ।
अचिन्त्यालोकदैरस्मान्मार्जितव्यं रजस्तमः ॥ १३ ॥

mṛdubhiḥ satkriyākuntairvivekārkātapairapi ,
acintyālokadairasmānmārjitavyaṃ rajastamaḥ 13

13. mṛdubhiḥ satkriyākuntaiḥ vivekārkātapaiḥ api
acintyālokadaiḥ asmāt mārjitavyam rajastamaḥ

13. rajastamaḥ asmāt mṛdubhiḥ satkriyākuntaiḥ api
vivekārkātapaiḥ acintyālokadaiḥ mārjitavyam

13. One should cleanse `rajas` (rajas) and `tamas` (tamas) from this (condition) by gentle spears of good actions (satkriyā) and by the sun-like rays of discrimination (viveka) which grant inconceivable illumination.

Words meanings summery:

• मृदुभिः (mṛdubhiḥ) - by soft, by gentle, by mild

• सत्क्रियाकुन्तैः (satkriyākuntaiḥ) - by spears of good actions, by spears of virtuous deeds

• विवेकार्कातपैः (vivekārkātapaiḥ) - by sun-like rays of discrimination, by the scorching rays of discernment

• अपि (api) - also, and, even

• अचिन्त्यालोकदैः (acintyālokadaiḥ) - by those giving inconceivable light/illumination

• अस्मात् (asmāt) - from this, from here

• मार्जितव्यम् (mārjitavyam) - should be cleansed, should be wiped away

• रजस्तमः (rajastamaḥ) - rajas and tamas

Words meanings and morphology

मृदुभिः (mṛdubhiḥ) - by soft, by gentle, by mild

(adjective)

Instrumental, plural of mṛdu

mṛdu - soft, gentle, mild, tender

Note: Agrees with satkriyākuntaiḥ

सत्क्रियाकुन्तैः (satkriyākuntaiḥ) - by spears of good actions, by spears of virtuous deeds

(noun)

Instrumental, masculine, plural of satkriyākunta

satkriyākunta - spears of good actions

Compound type : tatpuruṣa (sat+kriyā+kunta)

• sat – good, virtuous, existing, real
  adjective
  Present Active Participle
  Derived from root as (to be)
  Root: as (class 2)
• kriyā – action, deed, rite, activity
  noun (feminine)
• kunta – spear, lance, javelin
  noun (masculine)

विवेकार्कातपैः (vivekārkātapaiḥ) - by sun-like rays of discrimination, by the scorching rays of discernment

(noun)

Instrumental, masculine, plural of vivekārkātapa

vivekārkātapa - sun-like rays of discrimination

Compound type : tatpuruṣa (viveka+arka+ātapa)

• viveka – discrimination, discernment, clear understanding
  noun (masculine)
  Prefix: vi
  Root: vic (class 7)
• arka – sun, ray, praise, hymn
  noun (masculine)
• ātapa – sunshine, heat, warmth, ray of light
  noun (masculine)
  Prefix: ā
  Root: tap (class 1)

अपि (api) - also, and, even

(indeclinable)

अचिन्त्यालोकदैः (acintyālokadaiḥ) - by those giving inconceivable light/illumination

(adjective)

Instrumental, masculine, plural of acintyālokada

acintyālokada - giving inconceivable light

Compound type : tatpuruṣa (a+cintya+āloka+da)

• a – not, un-
  indeclinable
  Negative prefix
• cintya – to be thought, conceivable
  adjective
  Gerundive
  Derived from root cint (to think)
  Root: cint (class 10)
• āloka – light, sight, vision, observation
  noun (masculine)
  Prefix: ā
  Root: lok (class 1)
• da – giver, bestower
  suffix/adjective
  Agent noun suffix from root dā (to give)
  Root: dā (class 3)

Note: Agrees with vivekārkātapaiḥ

अस्मात् (asmāt) - from this, from here

(pronoun)

Ablative, singular of idam

idam - this, this one

मार्जितव्यम् (mārjitavyam) - should be cleansed, should be wiped away

(adjective)

Nominative, neuter, singular of mārjitavya

mārjitavya - to be cleansed, to be purified, to be wiped away

Gerundive

Derived from root mṛj (to cleanse, to wipe) with suffix -tavya

Root: mṛj (class 2)

Note: Agrees with rajastamaḥ

रजस्तमः (rajastamaḥ) - rajas and tamas

(noun)

Nominative, neuter, singular of rajastamas

rajastamas - the qualities of rajas (activity) and tamas (inertia)

Compound type : dvandva (rajas+tamas)

• rajas – the quality of activity, passion, energy, dust
  noun (neuter)
• tamas – the quality of inertia, ignorance, darkness
  noun (neuter)