The fourth Udasi was undertaken towards the west. Guru Nanak reached Pakpatan (Ajodhan) where he met with Sheikh Brahm who was the eleventh in succession to Baba Farid, whose Bani is also included in Guru Granth Sahib. The Guru had a wide range of discussion with Sheikh Brahm. The Guru stated,
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/gurmat-vichaar/19984-sakhees-related-to-shabads.html
"Thou art the tablet, O Lord, Thou art the pen, and Thou art also the writing, Speak of the one God; O Nanak, why should there be second." (Var Malar ki Mohalla 1, 28-2, p-1291) The Sheikh asked the Guru to explain, "You say ,'There is only one God, why should there be a second?', and the Sheikh asked:
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=19984
There is one Lord and two ways; Which shall I adopt, and which reject?" Guru ji replied:
"There is one Lord and one way; Adopt one and reject the other."