Classical Ayurveda groups ojas, tejas and prana as a triad of subtle essences underlying the grosser dhatus and doshas, with tejas specifically the refined, luminous form of the fire (agni) element, tejo mahabhuta, at work in the body. It is described as seated chiefly in the eyes, source of the light by which the mind perceives, and in the digestive fire, jatharagni, of the stomach and small intestine, the process by which food is broken down and transformed into tissue; both are treated as expressions of the same underlying radiance rather than separate forces.
Tejas is closely paired with pitta dosha, the humor built from fire and water that governs metabolism, body heat and understanding, so that a pitta-dominant constitution is described as naturally strong in tejas, sharp-sighted, sharp-witted and quick to anger when out of balance. Ayurvedic texts treat tejas as needing balance rather than maximization: too little leaves digestion weak and the mind dull, too much produces inflammation, acidity, irritability and burning sensations, and treatment for either direction works through diet, herbs and regimen rather than through a dedicated meditative technique of its own.