Word

Brahma sathyam jagan mithya

Sanskrit

ब्रह्म सत्यं जगन्मिथ्य

In General

"Brahma sathyam jagan mithya jovo brhmaiva napara" (ब्रह्म सत्यं जगन्मिथ्या जीवो ब्रह्मैव नापरः) is the Sankara advaitha in a nutshell. Only Brahman exist and the world of name and form is an illussion. To sankara there is no individual atman and all comprising Brahman. Atman and Brahman are same. Similarly Jagath is neither True nor False but an illussion.