The Isha Upanishad presents a philosophical puzzle that has generated more commentary than almost any other text of its length: how can you enjoy the world ("by that renounced, enjoy") while simultaneously knowing that "all this is clothed by the Lord"? The tradition's answers divide sharply along the Advaita/Vaishnava fault line.
Shankara's reading: the Isha teaches that since the Lord pervades everything, there is no independent "world" to be enjoyed — true renunciation means recognising that there is nothing to give up because there was nothing other than Brahman to begin with. The "enjoyment" after renunciation is the enjoyment of Brahman-recognition. Ramanuja and the Vaishnava tradition: the world is genuinely the Lord's manifestation — enjoyment is legitimate when the world is seen as belonging to the Lord and used in his service.
The Isha and the tension between knowledge and action
The central philosophical tension of the Isha: verses 1-8 seem to affirm the world and enjoin action (the person who sees the Lord in all beings, who works for a hundred years — these are praised). Verses 9-14 present the famous paradox of knowledge and ignorance (quoted above). Verses 15-18 are the dying person's hymn. No other Upanishad packs this range of concerns into 18 verses. Shankara devotes his entire Isha commentary to resolving the apparent contradiction between the active householder ideal of verses 1-8 and the renunciation ideal implicit in verses 9-14. Source: Gambhirananda (2004), Introduction to Isha.
The golden lid — Isha 15-16
Verses 15-16 contain one of the most striking images in the Upanishads: hiraṇmayena pātreṇa satyasyāpihitam mukham / tat tvaṃ pūṣann apāvṛṇu satya-dharmāya dṛṣṭaye — "The face of truth is covered by a golden lid. O Pushan (the sun), open it, that I who have truth as my dharma may see it." The sun-disk (aditya-mandala) in Vedic thought contains the face of the cosmic Person within it — behind the brilliant golden appearance of the phenomenal world lies the face of truth/Brahman. The prayer: remove the lid so that I may see. This is the Isha's most concentrated image of the Vedantic project: the whole phenomenal world is a "golden lid" concealing the truth that lies behind it. Source: Gambhirananda (2004), Isha 15-16.
Olivelle (1998). Gambhirananda (2004). Halbfass (1988).
Gandhi and the Isha — a modern appropriation
Mahatma Gandhi regarded the Isha Upanishad — specifically its first verse — as the key to his entire philosophy. His reading: "All this is pervaded by the Lord" means that no one has the right to own more than their fair share — the excess belongs to the Lord. "By that renounced, enjoy" means: give up the excess and enjoy what remains. This reading transforms a metaphysical text into a socioeconomic ethic — the basis of Gandhi's critique of capitalism and colonialism. Gandhi's use of the Isha Upanishad is a striking example of how Vedantic texts have been mobilised for contemporary social ethics. Source: Halbfass (1988); Flood (1996).