SB 2.10.15
antah sarira akasat
purusasya vicestatah
ojah saho balam jajñe
tatah prano mahan asuh
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
From the sky situated within the transcendental body of the manifesting Maha-Visnu, sense energy, mental force and bodily strength are all generated, as well as the sum total of the fountainhead of the total living force.