महाभारतः mahābhārataḥ - book-6, chapter-24, verse-48

योगस्थः कुरु कर्माणि सङ्गं त्यक्त्वा धनंजय ।
सिद्ध्यसिद्ध्योः समो भूत्वा समत्वं योग उच्यते ॥४८॥

48. yogasthaḥ kuru karmāṇi saṅgaṁ tyaktvā dhanaṁjaya ,
siddhyasiddhyoḥ samo bhūtvā samatvaṁ yoga ucyate.

48. yogasthaḥ kuru karmāṇi saṅgam tyaktvā dhanaṃjaya |
siddhyasiddhyoḥ samaḥ bhūtvā samatvam yogaḥ ucyate

48. dhanaṃjaya,
yogasthaḥ saṅgam tyaktvā siddhyasiddhyoḥ samaḥ bhūtvā karmāṇi kuru samatvam yogaḥ ucyate

48. O Dhanaṃjaya, being steadfast in spiritual discipline (yoga), perform your actions (karma) by abandoning attachment. Become equanimous in success and failure; this equanimity (samatva) is called spiritual discipline (yoga).

Words meanings summery:

• योगस्थः (yogasthaḥ) - one who is established in spiritual discipline (yoga) (established in yoga, steadfast in spiritual discipline)

• कुरु (kuru) - perform (your actions) (do, perform, make)

• कर्माणि (karmāṇi) - actions (karma) (actions, deeds, works)

• सङ्गम् (saṅgam) - attachment (attachment, contact, association)

• त्यक्त्वा (tyaktvā) - having abandoned (having abandoned, having given up, having renounced)

• धनंजय (dhanaṁjaya) - O Arjuna (conqueror of wealth, Arjuna)

• सिद्ध्यसिद्ध्योः (siddhyasiddhyoḥ) - in success and failure (of success and failure, in success and failure)

• समः (samaḥ) - equal (in mind), equanimous (equal, same, even, impartial)

• भूत्वा (bhūtvā) - having become, being

• समत्वम् (samatvam) - equanimity (samatva) (equanimity, equality, sameness)

• योगः (yogaḥ) - spiritual discipline (yoga) (spiritual discipline, union, conjunction, effort)

• उच्यते (ucyate) - is called (is said, is called, is declared)

Words meanings and morphology

योगस्थः (yogasthaḥ) - one who is established in spiritual discipline (yoga) (established in yoga, steadfast in spiritual discipline)

(adjective)

Nominative, masculine, singular of yogastha

yogastha - established in yoga, steadfast in spiritual discipline

Compound type : tatpuruṣa (yoga+stha)

• yoga – spiritual discipline, union, conjunction, effort
  noun (masculine)
  Root: yuj (class 7)
• stha – standing, abiding, existing, being in
  adjective
  agentive suffix
  derived from root sthā (to stand)
  Root: sthā (class 1)

कुरु (kuru) - perform (your actions) (do, perform, make)

(verb)

2nd person , singular, active, imperative (loṭ) of kṛ

imperative mood

2nd person, singular, imperative, active voice

Root: kṛ (class 8)

कर्माणि (karmāṇi) - actions (karma) (actions, deeds, works)

(noun)

Accusative, neuter, plural of karma

karma - action, deed, work, fate

Root: kṛ (class 8)

सङ्गम् (saṅgam) - attachment (attachment, contact, association)

(noun)

Accusative, masculine, singular of saṅga

saṅga - attachment, contact, association, clinging

from sam- √añj 'to smear, to apply'

Prefix: sam

Root: añj (class 7)

त्यक्त्वा (tyaktvā) - having abandoned (having abandoned, having given up, having renounced)

(indeclinable)

absolutive (gerund)

formed from root tyaj with suffix -ktvā

Root: tyaj (class 1)

धनंजय (dhanaṁjaya) - O Arjuna (conqueror of wealth, Arjuna)

(proper noun)

Vocative, masculine, singular of dhanaṃjaya

dhanaṁjaya - conqueror of wealth, a name of Arjuna

Compound type : tatpuruṣa (dhana+jaya)

• dhana – wealth, riches, property
  noun (neuter)
• jaya – victory, conquest, triumph
  noun (masculine)
  from root ji (to conquer)
  Root: ji (class 1)

सिद्ध्यसिद्ध्योः (siddhyasiddhyoḥ) - in success and failure (of success and failure, in success and failure)

(noun)

Locative, feminine, dual of siddhyasiddhi

siddhyasiddhi - success and failure

Compound type : dvandva (siddhi+asiddhi)

• siddhi – success, accomplishment, perfection
  noun (feminine)
  from root sidh (to succeed)
  Root: sidh (class 1)
• asiddhi – failure, non-accomplishment
  noun (feminine)
  negation of siddhi
  Prefix: a

Note: Can also be genitive dual, but locative fits the context better for 'in success and failure'.

समः (samaḥ) - equal (in mind), equanimous (equal, same, even, impartial)

(adjective)

Nominative, masculine, singular of sama

sama - equal, same, even, impartial, tranquil

भूत्वा (bhūtvā) - having become, being

(indeclinable)

absolutive (gerund)

formed from root bhū with suffix -ktvā

Root: bhū (class 1)

समत्वम् (samatvam) - equanimity (samatva) (equanimity, equality, sameness)

(noun)

Nominative, neuter, singular of samatva

samatva - equanimity, equality, sameness

abstract noun derived from sama (equal) with suffix -tva

Note: Could also be accusative, but nominative makes sense as the subject of the clause 'is called yoga'.

योगः (yogaḥ) - spiritual discipline (yoga) (spiritual discipline, union, conjunction, effort)

(noun)

Nominative, masculine, singular of yoga

yoga - spiritual discipline, union, conjunction, effort, equanimity

from root yuj (to join, to yoke)

Root: yuj (class 7)

उच्यते (ucyate) - is called (is said, is called, is declared)

(verb)

3rd person , singular, passive, present (lat) of vac

present tense, passive voice

3rd person, singular, present tense, passive voice (from root vac, conjugated as ucyate)

Root: vac (class 2)