These words once used to be popular among Sikhs. The Baani they refer to, namely forty Vaaran and 675 Kabitt-Savaiyye, were written by Bhai Gurdaas ji (d. 1636) at different periods of his life. He was then the honored scribe of Aad Bir, or first recession of Sri Guru Granth Sahib, thus his understanding and knowledge of Gurbaani can be held very close to Guru Sahib’s true intention with the Holy Word. Sikh tradition tells us that even though Guru Arjan Dev ji didn’t include Bhai Gurdaas ji’s writings in Sri Guru Granth Sahib, he awarded his Baani with the title Gurbaani di Kunji or ‘the Key to Guru’s Words.’