The Mukhya Upaniṣads

Kena · Khaṇḍa 2 · Known in Every Cognition

Mantra 4

प्रतिबोधविदितं मतममृतत्वं हि विन्दते ।आत्मना विन्दते वीर्यं विद्यया विन्दतेऽमृतम् ॥ ४ ॥

In plain words

Brahman is rightly understood as the awareness present in every cognition. Through that recognition one finds immortality. Through the Self one gains inner strength; through knowledge one finds the deathless.