Guru Nanak lived for a period of seventy years in this world .He wandered from place to place. He went to Sayyidpur in the district of Gujranwala. He then proceeded to Kurukshetra, Hardwar, Brindavan, Varanasi, Agra, Kanpur, Ayodhya, Prayag, Patna, Rajgir, Gaya and Puri. He travelled throughout India. He made four extensive tours. He went to Sri Lanka, Myanmar, Mecca and Medina also. He travelled to Bengal, the Deccan, Sri Lanka, Turkey, Arabia, Baghdad, Kabul, Kandahar and Siam. He held controversies with Pundits and Mohammedan priests.

He debated with the Pandas of Gaya, Hardwar and other places of pilgrimage. He dispelled the clouds of ignorance and doubts of many people. He enjoined on all people to live righteously and with brotherly love and hospitality. He preached and taught: "Do Nama Smarana. Love God. Be devoted to one God. Serve your fellow beings. God is all-in-all. Pray. Praise Him always. Attain the bliss of union with Him". Nanak succeeded remarkably in changing the minds of men and winning their love and confidence and in directing them along the path of righteousness and devotion. He tried his best to unite the Hindus and the Muslims.

Nanak proceeded to Multan. He halted by the side of a river. Multan was a place filled with Fakirs always. Prahlad was born at Multan. Shams Tabriez and Mansoor also lived there. The Pirs came to know that Guru Nanak had come to Multan. They sent him milk in a cup, filled to the very brim.

Nanak put inside the cup some Batashas—small hollow lumps of sugar—and a flower above them and returned the milk. Mardana told his master that a thing like milk should not be returned and should be drunk by him.

Guru Nanak replied, "Look here, Mardana. You are a simpleton. The Pirs have played a small trick. They have not sent this milk for my use. There is deep philosophy at the back of it. There is profound significance. The meaning is that Multan is already full of Pirs and Fakirs, just like the cup that is filled with milk to the very brim, and that there is no room for another religious teacher. I have also paid them in the same coin. My answer is that I will mix with them like the Batashah and would predominate over them like the flower placed in the cup of milk".

The Pirs and the Fakirs then came to see Guru Nanak. Nanak sang a song. The proud and arrogant Pirs came to their senses now. They became very humble. They said to Guru Nanak: "Pardon us, O revered Guru! We were surely self-conceited. Kindly give us spiritual instructions and bless us". Guru Nanak blessed them and gave them instructions.