योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-93, verse-88

बाल्यं यौवनवद्याति यौवनं याति बाल्यवत् ।
उपमानोपमेयत्वं भङ्गुरत्वं मिथोऽनयोः ॥ ८८ ॥

bālyaṃ yauvanavadyāti yauvanaṃ yāti bālyavat ,
upamānopameyatvaṃ bhaṅguratvaṃ mitho'nayoḥ 88

88. bālyam yauvanavat yāti yauvanam yāti bālyavat |
upamāna-upameyatvam bhaṅguratvam mithaḥ anayoḥ ||

88. bālyam yauvanavat yāti,
yauvanam bālyavat yāti.
anayoḥ mithaḥ upamāna-upameyatvam bhaṅguratvam (asti).

88. Childhood (bālyam) passes away like youth, and youth passes away like childhood. For these two, their mutual transience (bhaṅguratvam) is the state of being both the standard of comparison and the object of comparison.

Words meanings summery:

• बाल्यम् (bālyam) - childhood (bālyam) (childhood, infancy)

• यौवनवत् (yauvanavat) - like youth (like youth, as if it were youth)

• याति (yāti) - passes away (goes, passes away, moves)

• यौवनम् (yauvanam) - youth (youth, adolescence)

• बाल्यवत् (bālyavat) - like childhood (like childhood, as if it were childhood)

• उपमान-उपमेयत्वम् (upamāna-upameyatvam) - the state of being both the standard of comparison and the object of comparison (the state of being a standard of comparison and the object of comparison)

• भङ्गुरत्वम् (bhaṅguratvam) - mutual transience (bhaṅguratvam) (transitoriness, fragility, destructibility)

• मिथः (mithaḥ) - mutual (mutually, reciprocally, together)

• अनयोः (anayoḥ) - of these two (childhood and youth) (of these two, for these two)

Words meanings and morphology

बाल्यम् (bālyam) - childhood (bālyam) (childhood, infancy)

(noun)

Nominative, neuter, singular of bālya

bālya - childhood, infancy, childishness

derived from `bāla` (child)

Note: Subject of the first clause.

यौवनवत् (yauvanavat) - like youth (like youth, as if it were youth)

(indeclinable)

adverbial suffix `vat` added to `yauvana`

Note: Adverb modifying `yāti`.

याति (yāti) - passes away (goes, passes away, moves)

(verb)

3rd person , singular, active, present (laṭ) of yā

Present active indicative

Root: yā (class 2)

Note: Verb for `bālyam` and `yauvanam`.

यौवनम् (yauvanam) - youth (youth, adolescence)

(noun)

Nominative, neuter, singular of yauvana

yauvana - youth, adolescence

derived from `yuvan` (young person)

Note: Subject of the second clause.

बाल्यवत् (bālyavat) - like childhood (like childhood, as if it were childhood)

(indeclinable)

adverbial suffix `vat` added to `bālya`

Note: Adverb modifying `yāti`.

उपमान-उपमेयत्वम् (upamāna-upameyatvam) - the state of being both the standard of comparison and the object of comparison (the state of being a standard of comparison and the object of comparison)

(noun)

Nominative, neuter, singular of upamāna-upameyatva

upamāna-upameyatva - state of being comparable and the object of comparison

compound of `upamāna`, `upameya`, and `tva` suffix

Compound type : dvandva (upamāna+upameya+tva)

• upamāna – standard of comparison, similitude, example
  noun (neuter)
  from `mā` with `upa`
  Prefix: upa
  Root: mā (class 2)
• upameya – object of comparison, that which is to be compared
  noun (neuter)
  Gerundive (Karmaṇi Kṛtya)
  from `mā` with `upa`
  Prefix: upa
  Root: mā (class 2)
• tva – suffix forming abstract nouns, 'the state of being'
  suffix (neuter)
  Abstract noun suffix.

Note: Predicate nominative (implied `asti`).

भङ्गुरत्वम् (bhaṅguratvam) - mutual transience (bhaṅguratvam) (transitoriness, fragility, destructibility)

(noun)

Nominative, neuter, singular of bhaṅguratva

bhaṅguratva - transitoriness, fragility, destructibility, impermanence

derived from `bhaṅgura` (fragile, perishable) + `tva` (abstract suffix)

Compound type : tatpurusha (bhaṅgura+tva)

• bhaṅgura – fragile, perishable, breaking, liable to break
  adjective (neuter)
  from root `bhañj` (to break)
  Root: bhañj (class 7)
• tva – suffix forming abstract nouns, 'the state of being'
  suffix (neuter)
  Abstract noun suffix.

Note: Predicate nominative.

मिथः (mithaḥ) - mutual (mutually, reciprocally, together)

(indeclinable)

Note: Modifies the relationship between `upamāna-upameyatvam` and `anayoḥ`.

अनयोः (anayoḥ) - of these two (childhood and youth) (of these two, for these two)

(pronoun)

Genitive, neuter, dual of idam

idam - this, these

dual genitive/locative of `idam`

Note: Possessive for `upamāna-upameyatvam` and `bhaṅguratvam`.