महाभारतः mahābhārataḥ - book-3, chapter-198, verse-60

गुरुशुश्रूषणं सत्यमक्रोधो दानमेव च ।
एतच्चतुष्टयं ब्रह्मञ्शिष्टाचारेषु नित्यदा ॥६०॥

60. guruśuśrūṣaṇaṁ satyamakrodho dānameva ca ,
etaccatuṣṭayaṁ brahmañśiṣṭācāreṣu nityadā.

60. guruśuśrūṣaṇam satyam akrodhaḥ dānam eva ca
| etat catuṣṭayam brahman śiṣṭācāreṣu nityadā

60. O Brahmin, service to one's teacher (guruśuśrūṣaṇa), truth (satya), absence of anger (akrodha), and charity (dāna) – this fourfold group is always considered part of righteous conduct.

Words meanings summery:

• गुरुशुश्रूषणम् (guruśuśrūṣaṇam) - service to the guru/teacher

• सत्यम् (satyam) - truth, reality, honesty

• अक्रोधः (akrodhaḥ) - non-anger, absence of anger

• दानम् (dānam) - gift, charity, giving

• एव (eva) - indeed, only, just

• च (ca) - and, also

• एतत् (etat) - this

• चतुष्टयम् (catuṣṭayam) - a group of four, quartet

• ब्रह्मन् (brahman) - O Brahmin

• शिष्टाचारेषु (śiṣṭācāreṣu) - in righteous conduct, in the practices of the disciplined

• नित्यदा (nityadā) - always, constantly, perpetually

Words meanings and morphology

गुरुशुश्रूषणम् (guruśuśrūṣaṇam) - service to the guru/teacher

(noun)

Nominative, neuter, singular of guruśuśrūṣaṇa

guruśuśrūṣaṇa - service to the guru, attendance upon a teacher, obedience to a spiritual guide

Compound type : tatpuruṣa (guru+śuśrūṣaṇa)

• guru – teacher, spiritual guide, heavy, important
  noun (masculine)
• śuśrūṣaṇa – service, desire to hear, obedience
  noun (neuter)

सत्यम् (satyam) - truth, reality, honesty

(noun)

Nominative, neuter, singular of satya

satya - truth, reality, honesty, true, real

अक्रोधः (akrodhaḥ) - non-anger, absence of anger

(noun)

Nominative, masculine, singular of akrodha

akrodha - non-anger, absence of anger

Compound type : nañ-tatpuruṣa (a+krodha)

• a – not, non-
  prefix
• krodha – anger, wrath, fury
  noun (masculine)

दानम् (dānam) - gift, charity, giving

(noun)

Nominative, neuter, singular of dāna

dāna - gift, charity, giving, donation

एव (eva) - indeed, only, just

(indeclinable)

च (ca) - and, also

(indeclinable)

एतत् (etat) - this

(pronoun)

Nominative, neuter, singular of etad

etad - this, these

चतुष्टयम् (catuṣṭayam) - a group of four, quartet

(noun)

Nominative, neuter, singular of catuṣṭaya

catuṣṭaya - a group of four, quartet

ब्रह्मन् (brahman) - O Brahmin

(noun)

Vocative, masculine, singular of brahman

brahman - Brahmin (member of the priestly class), one who knows Brahman

शिष्टाचारेषु (śiṣṭācāreṣu) - in righteous conduct, in the practices of the disciplined

(noun)

Locative, masculine, plural of śiṣṭācāra

śiṣṭācāra - righteous conduct, proper practice, custom of good people

Compound type : tatpuruṣa (śiṣṭa+ācāra)

• śiṣṭa – disciplined, well-behaved, learned, righteous
  adjective (masculine)
  Past Passive Participle
  Derived from root śiṣ (to discipline, to teach)
  Root: śiṣ
• ācāra – conduct, practice, custom, usage
  noun (masculine)

नित्यदा (nityadā) - always, constantly, perpetually

(indeclinable)