|Canto 1: Creation||Chapter 6: Conversation Between Nārada and Vyāsadeva|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 1.6.27
evaḿ kṛṣṇa-mater brahman
kālaḥ prādurabhūt kāle
taḍit saudāmanī yathā
evam — thus; kṛṣṇa-mateḥ — one who is fully absorbed in thinking of Kṛṣṇa; brahman — O Vyāsadeva; na — not; āsaktasya — of one who is attached; amala-ātmanaḥ — of one who is completely free from all material dirt; kālaḥ — death; prādurabhūt — become visible; kāle — in the course of time; taḍit — lightning; saudāmanī — illuminating; yathā — as it is.
And so, O Brāhmaṇa Vyāsadeva, in due course of time I, who was fully absorbed in thinking of Kṛṣṇa and who therefore had no attachments, being completely freed from all material taints, met with death, as lightning and illumination occur simultaneously.
To be fully absorbed in the thought of Kṛṣṇa means clearance of material dirts or hankerings. As a very rich man has no hankerings for small petty things, so also a devotee of Lord Kṛṣṇa, who is guaranteed to pass on to the kingdom of God, where life is eternal, fully cognizant and blissful, naturally has no hankerings for petty material things, which are like dolls or shadows of the reality and are without permanent value. That is the sign of spiritually enriched persons. And in due course of time, when a pure devotee is completely prepared, all of a sudden the change of body occurs which is commonly called death. And for the pure devotee such a change takes place exactly like lightning, and illumination follows simultaneously. That is to say a devotee simultaneously changes his material body and develops a spiritual body by the will of the Supreme. Even before death, a pure devotee has no material affection, due to his body's being spiritualized like a red-hot iron in contact with fire.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness