Shantideva (Sanskrit: Śāntideva; Chinese: 寂天; Tibetan: ཞི་བ་ལྷ།, THL: Zhiwa Lha; Mongolian: Шантидэва гэгээн; Vietnamese: Tịch Thiên) was an 8th-century CE Indian philosopher, Buddhist monk, poet, and scholar at the mahavihara of Nalanda. He was an adherent of the Mādhyamaka philosophy of Nāgārjuna.
That's the secret to life... replace one worry with another....