Mazdá is the Ahûrá/Æsir par excellence in Zoroastrianism. Mazdá is the essence of godhood and all the ahûrás/æsir are different aspects, virtues, powers of Mazdá.
Mazdá and/or Ma(n)zdá (*mens-dheh-) incorporates the Indo European noun *mens of the stem ménos “mind-force, passion, spirit, will power, determination, resolve” and the verb dheh “to set, establish, do, create.” (Courtesy of Didier Calin)
Mazdá is thus “creative mind-force, power of the spirit/mind to devise/create, passion to innovate.”
In other Indo European traditions, the Vedic Varuna (the supreme god of virtues) seem to share many qualities and epithets such as Medha (mindfulness, insight) with Mazdá Ahûrá.
Medhá, “mind-power, creativity, imagination and vision” is the Vedic equivalent for Mazdá and occurs as an epithet of the most powerful god-beings in the Vedas.
Óðinn the greatest æsir in Norse beliefs is almost the exact same as the Mazdá Ahûrá of Zoroastrianism. Óðinn is the æsir, god power of “poetic inspiration, power of mind/passion and the renewal of memory.”
However, MUSES in ancient Greek lore are probably the closest in idea as well as etymology to Mazdá, the ahûrá par excellence in Zoroastrianism.
MUSES inspire music, melody and poetic measure. They are the primordial nine personifications of CREATIVE INSIGHT.
Muses are of one spirit/mind. It is believed that by calling upon and receiving the mind-power, wisdom/creative insight of the MUSES, a poet, seer or musician could transcend the ordinary bounds of talent and rise to unimagined, new levels of creativity and intuitive wisdom.
Mortal men who have been instructed by the Muses are raised aloft to heaven [ouranos], for creativity, imagination and the power of thought/mind lift men’s souls to heavenly heights; (Compare with Yasna 28.4, 1st rhymed verse line of the poetic gathas.)
The noun Μοῦσα derives from the Indo-European root *men-, “think, put in mind” in verb formations with transitive function and “have in mind, be mindful of, commit to memory” in those with intransitive function.
This is reflected in the mythological relationship of the divine Muses with μνημοσύνη in the sense of “poetic recall,” the skill of making song and poetry through the power of mind, memory and imagination.
The Muses—collectively “the mind/intent/spirit” of the seer-poet begin and end with forms of *men-/mneh2- and/or *h2u̯eid- in the Homeric Hymns.
Muses are invoked at the beginning of various lyrical poems, so that the Muses give inspiration or speak through the seer-poetic verse/measure.
In conclusion, I have to state that Mazdá “creative mind-power, innovative spirit” is the magic stuff of the æsir, and what the Vedas call ásurasya māyáyā (See RV 5.63.7 “magic of the ásuras.)
Prophet Zarathûštrá revealed that “the passion/power of mind, the creative insight” is the essence of godhood.
Mazdá, Medhá, MUSES or Óðinn are all passion/mind-power unleashed, the power of the spirit to do, create and triumph.”
For all those who might be interested, the term Medhá equivalent of Mazdá is mentioned at the following verses in the Rig Veda.
1.018.06c saním medhā́m ayāsiṣam
2.034.07d saním medhā́m áriṣṭaṃ duṣṭáraṃ sáhaḥ
4.033.10a yé hárī medháyā ukthā́ mádanta
5.027.04d dádan medhā́m r̥tāyaté
5.043.13a ā́ dharṇasír br̥háddivo rárāṇo
5.043.13b víśvebhir gantu ómabhir huvānáḥ
5.043.13c gnã́ vásāna óṣadhīr ámr̥dhras
5.043.13d tridhā́tuśr̥ṅgo vr̥ṣabhó vayodhā́ḥ
7.104.06c yā́ṃ vāṃ hótrām parihinómi medháyā
8.006.10b medhā́m r̥tásya jagrábha
8.052.09d stotúr medhā́ asr̥kṣata
9.009.09c sánā medhā́ṃ sánā súvaḥ
9.026.03a táṃ vedhā́m medháyāhiyan
9.032.06c saním medhā́m utá śrávaḥ
9.065.16a rā́jā medhā́bhir īyate
9.107.25d medhā́m abhí práyāṃsi ca
10.091.08a medhākāráṃ vidáthasya prasā́dhanam
In Rig Veda 7.087.04a, Varuna is also called medhira “full of passion, mind-power and wit” uvāca me váruṇo médhirāya.