योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-58, verse-30

स्वविचारणयैवाशु शाम्यत्यन्तर्मनोज्वरः ।
शरदागममात्रेण मिहिका महती यथा ॥ ३० ॥

svavicāraṇayaivāśu śāmyatyantarmanojvaraḥ ,
śaradāgamamātreṇa mihikā mahatī yathā 30

30. svavicāraṇayā eva āśu śāmyati antar manojvaraḥ
śaradāgamamātreṇa mihikā mahatī yathā

30. yathā śaradāgamamātreṇa mahatī mihikā (śāmyati)
tathā svavicāraṇayā eva āśu antar manojvaraḥ śāmyati

30. Through self-inquiry (svavicāraṇā) alone, the inner mental anguish (manojvara) quickly subsides, just as a thick fog (mihikā) disperses with the mere arrival of autumn.

Words meanings summery:

• स्वविचारणया (svavicāraṇayā) - by self-inquiry, by self-investigation

• एव (eva) - alone, only, indeed

• आशु (āśu) - quickly, swiftly, immediately

• शाम्यति (śāmyati) - subsides, calms down, becomes tranquil

• अन्तर् (antar) - within, internally, inside

• मनोज्वरः (manojvaraḥ) - mental fever, mental anguish, mental suffering

• शरदागममात्रेण (śaradāgamamātreṇa) - by the mere arrival of autumn, just by autumn's advent

• मिहिका (mihikā) - mist, fog, dew

• महती (mahatī) - thick (mist) (great, large, vast, important)

• यथा (yathā) - as, just as, according to

Words meanings and morphology

स्वविचारणया (svavicāraṇayā) - by self-inquiry, by self-investigation

(noun)

Instrumental, feminine, singular of svavicāraṇā

svavicāraṇā - self-inquiry, self-investigation

Compound type : tatpuruṣa (sva+vicāraṇā)

• sva – own, self
  pronoun
• vicāraṇā – inquiry, investigation, deliberation
  noun (feminine)
  derived from verb `vi-car` (to investigate)
  Prefix: vi
  Root: car (class 1)

एव (eva) - alone, only, indeed

(indeclinable)

आशु (āśu) - quickly, swiftly, immediately

(indeclinable)

शाम्यति (śāmyati) - subsides, calms down, becomes tranquil

(verb)

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

Root: śam (class 4)

अन्तर् (antar) - within, internally, inside

(indeclinable)

मनोज्वरः (manojvaraḥ) - mental fever, mental anguish, mental suffering

(noun)

Nominative, masculine, singular of manojvara

manojvara - mental fever, mental anguish

Compound type : tatpuruṣa (manas+jvara)

• manas – mind, intellect, thought
  noun (neuter)
  Root: man (class 4)
• jvara – fever, anguish, distress
  noun (masculine)
  Root: jvar (class 1)

शरदागममात्रेण (śaradāgamamātreṇa) - by the mere arrival of autumn, just by autumn's advent

(noun)

Instrumental, neuter, singular of śaradāgamamātra

śaradāgamamātra - mere arrival of autumn

Compound type : tatpuruṣa (śarat+āgama+mātra)

• śarat – autumn
  noun (feminine)
• āgama – arrival, coming
  noun (masculine)
  Prefix: ā
  Root: gam (class 1)
• mātra – mere, only, measure
  adjective (neuter)

मिहिका (mihikā) - mist, fog, dew

(noun)

Nominative, feminine, singular of mihikā

mihikā - mist, fog, dew

महती (mahatī) - thick (mist) (great, large, vast, important)

(adjective)

Nominative, feminine, singular of mahat

mahat - great, large, vast, important

यथा (yathā) - as, just as, according to

(indeclinable)