योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-4, verse-31

आपातमधुरारम्भं मध्ये सौभाग्यवर्धनम् ।
अनुत्तमफलोदर्कं पुण्यं त्वदनुशासनम् ॥ ३१ ॥

āpātamadhurārambhaṃ madhye saubhāgyavardhanam ,
anuttamaphalodarkaṃ puṇyaṃ tvadanuśāsanam 31

31. āpātamadhurārambham madhye saubhāgyavardhanam
anuttamaphalodarkam puṇyam tvat anuśāsanam

31. tvat anuśāsanam āpātamadhurārambham madhye
saubhāgyavardhanam anuttamaphalodarkam puṇyam

31. Your instruction (anuśāsanam) is pleasant at its beginning, enhances auspiciousness (saubhāgya) in the middle, and brings an unsurpassed result in the end; it is truly meritorious (puṇyam).

Words meanings summery:

• आपातमधुरारम्भम् (āpātamadhurārambham) - pleasant at the outset, sweet at the beginning

• मध्ये (madhye) - in the middle, amidst, during

• सौभाग्यवर्धनम् (saubhāgyavardhanam) - increasing auspiciousness, enhancing well-being

• अनुत्तमफलोदर्कम् (anuttamaphalodarkam) - yielding an unsurpassed ultimate result

• पुण्यम् (puṇyam) - meritorious, virtuous, sacred, pure

• त्वत् (tvat) - your, by you, from you

• अनुशासनम् (anuśāsanam) - instruction, teaching, command, discipline

Words meanings and morphology

आपातमधुरारम्भम् (āpātamadhurārambham) - pleasant at the outset, sweet at the beginning

(adjective)

Nominative, neuter, singular of āpātamadhurārambha

āpātamadhurārambha - having a beginning that is sweet at first glance or at the outset

Compound type : bahuvrīhi (āpāta+madhura+ārambha)

• āpāta – first glance, sudden appearance, at once
  indeclinable
  Prefix: ā
  Root: pat (class 1)
• madhura – sweet, pleasant, charming
  adjective (neuter)
• ārambha – beginning, undertaking, commencement
  noun (masculine)
  Prefix: ā
  Root: rabh (class 1)

Note: Adjective modifying 'anuśāsanam'

मध्ये (madhye) - in the middle, amidst, during

(noun)

Locative, neuter, singular of madhya

madhya - middle, center, mid-point

Note: Used adverbially

सौभाग्यवर्धनम् (saubhāgyavardhanam) - increasing auspiciousness, enhancing well-being

(adjective)

Nominative, neuter, singular of saubhāgyavardhana

saubhāgyavardhana - that which increases auspiciousness or good fortune

Compound type : tatpuruṣa (saubhāgya+vardhana)

• saubhāgya – auspiciousness, good fortune, well-being, prosperity
  noun (neuter)
• vardhana – increasing, causing to grow, enhancing
  adjective (masculine)
  agent noun/action noun
  From √vṛdh (to grow) with suffix -ana
  Root: vṛdh (class 1)

Note: Adjective modifying 'anuśāsanam'

अनुत्तमफलोदर्कम् (anuttamaphalodarkam) - yielding an unsurpassed ultimate result

(adjective)

Nominative, neuter, singular of anuttamaphalodarka

anuttamaphalodarka - having an unsurpassed ultimate consequence/result

Compound type : bahuvrīhi (anuttama+phala+udarka)

• anuttama – not supreme, not excellent, unsurpassed
  adjective (masculine)
  nañ-tatpuruṣa of 'uttama'
• phala – fruit, result, consequence, reward
  noun (neuter)
• udarka – ultimate result, end, consequence, future
  noun (masculine)
  Prefix: ud
  Root: ark

Note: Adjective modifying 'anuśāsanam'

पुण्यम् (puṇyam) - meritorious, virtuous, sacred, pure

(adjective)

Nominative, neuter, singular of puṇya

puṇya - merit, virtue, good deed, sacred

Note: Adjective modifying 'anuśāsanam'

त्वत् (tvat) - your, by you, from you

(pronoun)

Genitive, singular of yuṣmad

yuṣmad - you (singular, dual, plural)

Note: Stem form used in compound-like context, meaning 'your'

अनुशासनम् (anuśāsanam) - instruction, teaching, command, discipline

(noun)

Nominative, neuter, singular of anuśāsana

anuśāsana - instruction, teaching, command, discipline, rule

action noun

From √śās (to teach, rule) with prefix 'anu' and suffix '-ana'

Prefix: anu

Root: śās (class 2)

Note: Subject of the sentence