My dear brāhmaṇa, austerity in the form of meditation is My heart, Vedic knowledge in the form of hymns and mantras constitutes My body, and spiritual activities and ecstatic emotions are My actual form. The ritualistic ceremonies and sacrifices, when properly conducted, are the various limbs of My body, the unseen good fortune proceeding from pious or spiritual activities constitutes My mind, and the demigods who execute My orders in various departments are My life and soul.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तपो मे हृदयं ब्रह्मंस्तनुर्विद्या क्रियाऽऽकृतिः । अङ्गानि क्रतवो जाता धर्म आत्मासवः सुराः
tapo me hṛdayaṃ brahmaṃstanurvidyā kriyā''kṛtiḥ | aṅgāni kratavo jātā dharma ātmāsavaḥ surāḥ
SB 6.4.46