Om Tat Sat (Sanskrit: ओम् तत् सत्, Aum Tat Sat) is a mantra in Sanskrit which literally ‘All that is the Truth’, essentially meaning the 'Supreme and Absolute Truth'. * Om refers to the Supreme Infinite Spirit or Person. Om represents the Shabda Brahman. * Tat refers to 'that', or 'all that is'. * Sat refers to 'the absolute truth', that which is not evanescent or ephemeral, the underlying basis of everything, which is most fundamental and universal. ‘Sat’ is the one and only reality. Om Tat Sat also reflects the Mahavakya of the Upanishads i.e. Tat Tvam Asi.