The final verse of the Kena Upanishad confirms the goal that is attained by the seeker who carries out the programme defined and is successfully able to shift the standpoint away from the egoistic ignorance to the divine knowledge. The concept of evil is tied to the ignorance, the thoughts and actions that are divided from the truth, that act from the standpoint of the fragmented egoistic perspective and that thereby are causes of pain and suffering.
4th part, Verse 9: “He who knows this knowledge, smites evil away from him and in that vaster world and infinite heaven finds his foundation, yea, he finds his foundation.”
Sri Aurobindo observes: “The goal of the ascent is the world of the true and vast existence of which the Veda speaks as the Truth that is the final goal and home of man. It is described here as the greater infinite heavenly world, (Swargaloka, Swarloka of the Veda), which is not the lesser Swarga of the Puranas or the lesser Brahmaloka of the Mundaka Upanishad, its world of the sun’s rays to which the soul arrives by works of virtue and piety, but falls from them by the exhaustion of their merit; it is the higher Swarga or Brahman-world of the Katha which is beyond the dual symbols of birth and death, the higher Brahman-worlds of the Mundaka which the soul enters by knowledge and renunciation. It is therefore a state not belonging to the Ignorance, but to Knowledge. It is, in fact, the infinite existence and beatitude of the soul in the being of the all-blissful existence; it is too the higher status, the light of the Mind beyond the mind, the joy and eternal mastery of the Life beyond the life, the riches of the Sense beyond the senses. And the soul finds in it not only its own largeness but finds too and possesses the infinity of the One and it has firm foundation in that immortal state because there a supreme Silence and eternal Peace are the secure foundations of eternal Knowledge and absolute Joy.”
Sri Aurobindo, The Upanishads, Kena Upanishad and analysis, pg. 107, 177-183