Sikhism (); or Sikhi (', , from ), is a monotheistic and panentheistic religion that originated in the Punjab region of the Indian subcontinent around the end of the 15th century CE. Sikhism is one of the youngest of the major religions and the world's fifth-largest organized religion, with about 30 million Sikhs . However, according to rough estimates, there are around 120–150 million (12–15 crore) Nanak Naam Lewas people across the world who also believe in 10 Sikh Gurus and Guru Granth Sahib. developed from the spiritual teachings of Guru Nanak, the first Guru (1469–1539), and of the nine Sikh gurus who succeeded him. The tenth guru, Gobind Singh (1666–1708), named the Sikh scripture "Guru Granth Sahib" as his successor, bringing to a close the line of human gurus and establishing the scripture as the eternal, religious spiritual guide for Sikhs. Guru Nanak taught that living an "active, creative, and practical life" of "truthfulness, fidelity, self-control and purity" is above metaphysical truth, and that the ideal man "establishes union with God, knows His Will, and carries out that Will". Guru Hargobind, the sixth Sikh Guru (1606–1644), established the concept of mutual co-existence of the "miri" (political/temporal) and "piri" (spiritual) realms.