Śivasaṃhitā 5.37

The expression kṣaṇamātram—“for even one instant”—is remarkable for its accessibility: no prolonged contemplation of hours or days is required, only the clear perception of inner light during a single kṣaṇa (moment). This indicates that the transformation produced by vision of teja (radiant light) is not proportional to time but to the quality of perception: one instant of authentic vision outweighs hours of mechanical practice.

Teja—“brightness,” “radiance,” “transformative energy”—differs from simple jyoti (light): it carries the connotation of radiant heat, transforming power. Nirākula—“without perturbation,” “without agitation”—qualifies the vision: glimpsing light in an agitated mind is insufficient; the vision must occur in a state of genuine stillness. This condition of calm (śānta) is simultaneously prerequisite and result of correct kumbhaka practice.

The idea that a single instant of genuine perception suffices to radically transform the practitioner has precedents in Zen Buddhism (satori) and Advaita Vedānta (nirvikalpa samādhi). In the Śaiva tradition, this instant is called spanda—the primordial vibration of consciousness—and its recognition, however fleeting, leaves an indelible mark on the mind’s structure. Subsequent practice consolidates what that instant revealed.