The important message written at the temple facade is one of the four Mahāvākyas of Advaita or the non-dualistic school of philosophy. 

Tat Tvam Asi, the 3rd of four Mahavakyas which in sanskrit translates to "Thou Art That" is the principle philosophy that governs the temple and pilgrimage. 

As the pilgrimage is symbolic for the journey to self realization that all living beings possess the essence of Brahman, pilgrims refer to each other as Swami, acknowledging their divinity.

It means, in short, you are part of the Paramatma which is the quintessence of Advaita philosophy.