Vānaprastha-vṛtti and the Transition toward the Fourth Āśrama (वानप्रस्थवृत्तिः चतुर्थाश्रमोपक्रमश्च)
जलरूपमिवाकाशे तथैवात्मनि पश्यति । अपां व्यतिक्रमे चास्य वह्लिरूपं प्रकाशते
jalarūpam ivākāśe tathaivātmani paśyati | apāṁ vyatikrame cāsya vahlirūpaṁ prakāśate ||
Vyāsa said: As though the whole expanse of space were nothing but water, he perceives everything in the form of water; and in the same way he experiences the Self as water—this occurs while he is concentrating on the water-element. Then, when that water-state subsides, during concentration on the fire-element, fire alone shines forth to him everywhere.
व्यास उवाच
The verse describes how concentrated meditation on a particular element (water, then fire) can so saturate perception that the meditator experiences the world—and even the sense of self—in that elemental form; when that state ceases, a new elemental perception arises. It highlights the mind’s power to shape experience and the disciplined progression of yogic concentration.
Vyāsa is explaining a yogic process of dhāraṇā: first the practitioner holds the water-element in awareness, seeing space and the inner self as water; afterward, when the water-concentration dissolves, he takes up the fire-element and perceives fire shining everywhere.