Lord Rudra --- The Heart of Rishi Śvetāśvatara.

Lord Rudra --- The Heart of Rishi Śvetāśvatara.

Sage Shvetashvatara got this knowledge of Brahman, which is very sacred and revered by many great sages, through his penance and through God's grace, and he taught it very well to his disciples." ( Śvetāśvatara Upanishad VI-21)

1)

yo devo agnau yo’psu
yo viśvaṃ bhuvanam āviveśa
ya oṣadhīṣu yo vanaspatiṣu
tasmai devāya namo namaḥ ( Śvetāśvatara Upanishad II-17 )

The Self—luminous Lord, who is fire, who is in water, who has entered into the whole world, who is in plants, who is in trees— to that Lord let there be adoration! Yea, let there be adoration!

The above mantra was actually adapted from Yajurveda Taittiriya Samhita. The verse is addressed to Rudra. The verse describes the omnipresence of Lord Rudra. It says that Rudra is the indweller of elements of nature and beings as well. So it is clear that the Rudra of Śvetāśvatara Upanishad is none other than lord Rudra of Vedas.

Adapted from:

Yo rudro agnau yo apsu ya oshhadhishhu
Yo rudro vishva bhuvanaaavivesha tasmai rudraya namo astu (YV 5:5:9-i )

MEANING: The Rudra in the fire, in the waters, in the plants, the Rudra that hath entered all beings, to that Rudra be homage.

Om Namah Shivay.