aham — I; ātmā — the soul; guḍākeśa — O Arjuna; sarva-bhūta — of all living entities; āśaya-sthitaḥ — situated within the heart; aham — I am; ādiḥ — the origin; ca — also; madhyam — middle; ca — also; bhūtānām — of all living entities; antaḥ — end; eva — certainly; ca — and.