ŚVETĀŚVATARA UPANISHAD · 2.8

त्रिरुन्नतं स्थाप्य समं शरीरं हृदीन्द्रियाणि मनसा संनिवेश्य ।
ब्रह्मोडुपेन प्रतरेत विद्वान् स्रोतांसि सर्वाणि भयावहानि ॥

trirunnataṃ sthāpya samaṃ śarīraṃ hṛdīndriyāṇi manasā saṃniveśya ।
brahmoḍupena pratareta vidvān srotāṃsi sarvāṇi bhayāvahāni ॥

If a wise man hold his body with its three erect parts (chest, neck, and head) even, and turn his senses with the mind towards the heart, he will then in the boat of Brahman cross all the torrents which cause fear.