Guru Nanak Dev, Modi said, is not the legacy of Sikhs alone but an inspiration for entire humanity, he said.
"Guru Nanak Dev besides being a guru, is a thought, the basis of life. Our values, culture, our thoughts, our thinking, our upbringing, our reasoning, our speech, all of these have been honed by pious souls like Guru Nanak," he said.
When Guru Nanak Dev set out on his travels from Sultanpur Lodhi, who knew what change he would usher, he said. Modi said the Guru himself had proclaimed that he had set out on the 'yatras' to pull society out of injustice, darkness and inequalities.
Modi also touched the issue of environment and drugs on the occasion.
"We have become irresponsible about the environment," the prime minister said.