What was Baba's fundamental advice to his devotees for living a happy and worry-free life?

According to the teachings presented in Chapter 17, Baba's constant advice to his devotees was to 'not worry in the least; always be full of joy; do not worry until death.' This guidance is a practical translation of the Taittiriya Shruti principle that 'Brahman is bliss.' The chapter emphasizes that this boat of Sai's teachings will help one cross the ocean of existence. Therefore, the fundamental instruction for a happy life is to remain joyful and free from worry, trusting in Baba's wisdom and the inherent bliss of the ultimate reality, as he knew the cause and effect of all things.