Punjab Singh suffered brain injuries in the 2012 Sikh temple shooting, which left six people dead and four others wounded. The 66-year-old still can't move or speak, but his family hasn't lost hope for recovery.
Raghuvinder Singh says his father taught him chardhi (CHAR'-dee) kala (kah-LAH'). The Sikh principle refers to a state of constant optimism, which reflects an acceptance of God's will. He says he respects his father's teaching and practises it.