Here the two signify the Higher Self and the lower self, dwelling in the innermost cave of the heart. The Seers of Truth, as well as householders who follow the path of rituals and outer forms with the hope of enjoying the fruits of their good deeds, both proclaim that the Higher Self is like a light and the lower self like a shadow. When the Truth shines clearly in the heart of the knower, then he surmounts the apparent duality of his nature and becomes convinced that there is but One, and that all outer manifestations are nothing but reflections or projections of that One.Katha 141 · Upanishads · Katha-Upanishad
Katha 141
Upanishads · translated by Swami Paramananda
Themes in this passage
TruthHopeKarmaLoveFaithPeaceHumilityPride
Truth in other traditions
The same theme, as Islam, Buddhism, Christianity and Hellenism address it.
Confound not truth with falsehood, nor knowingly conceal the truth.Quran 2:42 · Quran · The Cow
They who know truth in truth, and untruth in untruth, arrive at truth, and follow true desires.Dhp 1.12 · Dhammapada · The Twin-Verses
Sanctify them through thy truth: thy word is truth.John 17:17 · Bible · John
Stopp’d in the tumult Cleobulus lies, Beneath Oïleus’ arm, a living prize; A living prize not long the Trojan stood; The thirsty falchion drank his reeking blood: Plunged in his throat the smoking weapon lies; Black death, and fate unpitying, seal his eyes.Iliad 16.33 · Iliad · 16
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