योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-144, verse-12

अपूर्वत्वात्स्मृतिः स्वप्नः संकल्पार्थानुभूतिषु ।
स्वमृत्यनुभवाद्यास्तु दृष्टार्थसदृशीषु च ॥ १२ ॥

apūrvatvātsmṛtiḥ svapnaḥ saṃkalpārthānubhūtiṣu ,
svamṛtyanubhavādyāstu dṛṣṭārthasadṛśīṣu ca 12

12. apūrvatvāt smṛtiḥ svapnaḥ saṅkalpārthānubhūtiṣu
svamṛtyanubhavādyāḥ tu dṛṣṭārthasadṛśīṣu ca

12. smṛtiḥ svapnaḥ saṅkalpārthānubhūtiṣu apūrvatvāt [bhavanti]
tu svamṛtyanubhavādyāḥ ca dṛṣṭārthasadṛśīṣu [bhavanti]

12. Memory, dreams, and the experiences of conceptualized objects are due to their unprecedented nature (apūrvatva). However, experiences such as one's own death, and others like them, are categorized among those that resemble observed phenomena.

Words meanings summery:

• अपूर्वत्वात् (apūrvatvāt) - because of unprecedentedness, due to novelty, from being unexperienced before

• स्मृतिः (smṛtiḥ) - memory, recollection

• स्वप्नः (svapnaḥ) - dream, sleep

• सङ्कल्पार्थानुभूतिषु (saṅkalpārthānubhūtiṣu) - in the experiences of conceived objects/ideas, in conceptual experiences

• स्वमृत्यनुभवाद्याः (svamṛtyanubhavādyāḥ) - experiences such as one's own death, and others

• तु (tu) - but, however, on the other hand

• दृष्टार्थसदृशीषु (dṛṣṭārthasadṛśīṣu) - among those similar to seen objects/meanings

• च (ca) - and

Words meanings and morphology

अपूर्वत्वात् (apūrvatvāt) - because of unprecedentedness, due to novelty, from being unexperienced before

(noun)

Ablative, neuter, singular of apūrvatva

apūrvatva - unprecedentedness, novelty, being new, never-before-seen

derived from apūrva (adjective) + tva (suffix for abstract noun)

स्मृतिः (smṛtiḥ) - memory, recollection

(noun)

Nominative, feminine, singular of smṛti

smṛti - memory, recollection, remembrance (smṛti)

from root smṛ

Root: smṛ (class 1)

स्वप्नः (svapnaḥ) - dream, sleep

(noun)

Nominative, masculine, singular of svapna

svapna - dream, sleep

from root svap

Root: svap (class 2)

सङ्कल्पार्थानुभूतिषु (saṅkalpārthānubhūtiṣu) - in the experiences of conceived objects/ideas, in conceptual experiences

(noun)

Locative, feminine, plural of saṅkalpārthānubhūti

saṅkalpārthānubhūti - experience of conceived objects

compound

Compound type : tatpuruṣa (saṅkalpa+artha+anubhūti)

• saṅkalpa – conception, intention, resolve, mental construct
  noun (masculine)
  from sam-kḷp
  Prefix: sam
  Root: kḷp (class 1)
• artha – object, purpose, meaning, thing
  noun (masculine)
• anubhūti – experience, perception
  noun (feminine)
  from anu-bhū
  Prefix: anu
  Root: bhū (class 1)

स्वमृत्यनुभवाद्याः (svamṛtyanubhavādyāḥ) - experiences such as one's own death, and others

(noun)

Nominative, masculine, plural of svamṛtyanubhavādi

svamṛtyanubhavādi - beginning with the experience of one's own death, etc.

compound

Compound type : bahuvrīhi (sva+mṛtyu+anubhava+ādi)

• sva – one's own, self
  pronoun
• mṛtyu – death
  noun (masculine)
  from root mṛ
  Root: mṛ (class 6)
• anubhava – experience
  noun (masculine)
  from anu-bhū
  Prefix: anu
  Root: bhū (class 1)
• ādi – beginning, etcetera, and so on
  noun (masculine)

Note: Functions as an adjective for an implied plural noun like 'experiences' (anubhavāḥ).

तु (tu) - but, however, on the other hand

(indeclinable)

दृष्टार्थसदृशीषु (dṛṣṭārthasadṛśīṣu) - among those similar to seen objects/meanings

(adjective)

Locative, feminine, plural of dṛṣṭārthasadṛśī

dṛṣṭārthasadṛśī - similar to seen objects/meanings

compound

Compound type : tatpuruṣa (dṛṣṭa+artha+sadṛśī)

• dṛṣṭa – seen, observed
  adjective
  Past Passive Participle
  from root dṛś
  Root: dṛś (class 1)
• artha – object, meaning, purpose, thing
  noun (masculine)
• sadṛśī – similar, resembling (feminine form)
  adjective (feminine)
  feminine form of sadṛśa
  Prefix: sa

Note: Qualifies an implied feminine plural noun, e.g., 'things' or 'experiences'.

च (ca) - and

(indeclinable)