Lord Hayagreeva is believed to be a form of Vishnu and He is worshipped as the God of Wisdom/Knowledge.
ज्ञानानन्दमयं देवं निर्मल स्फटिकाकृतिम्
आधारं सर्व विद्द्यानां हयग्रीवं उपास्महे
jnAnAnandamayam devam nirmala sphatikAkrutim
AdhAram sarva vidyAnAm hayagrIvam upAsmahe
ஞானானந்தமயம் தேவம் நிர்மல ஸ்படிகாக்ருதிம்
ஆதாரம் சர்வ வித்யானாம் ஹயக்ரீவமுபாஸ்மாஹே
(I worship Lord Hayagreeva, who is the very form of knowledge, pure as a
crystal, and who is the support of all knowledge.)
"Ever engaged in making the mind steadfast in spiritual communion and having all the impurities of the mind effaced thereby, the Yogin easily experiences the intense Bliss of contact with Brahman." - Srimad Bhagavad Gita
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