Sri Guru Nanak Sahib first put on an illuminous human form to shower grace on all mankind, to redeem the ailing and sinning humanity in this dark-age of Kalyug and in due course of time, attired Himself in the Holy Garb of Sri Guru Granth Sahib, a form of an eternal grace.
Actually he opened the flood gates of his grace to the world through Sri Guru Granth Sahib for all times to come. From his lotus feet flows the mighty Ganges of grace. Anyone who had seen or heard Sri Guru Nanak Sahib was saved because having seen the sun of grace or having heard the nectarous words of grace flowing from his holy lips, one was automatically saved. Sri Guru Nanak Sahib is an ocean of grace, mercy, compassion, benevolence, kindness, blessedness.
His grace is most miraculous. Miraculous effect of this grace on mankind during his life-time and thereafter is a common knowledge. For the eternal to assume a human form does not limit him to that body and to his physical presence at one place only. His eternity and power of eternal presence plays a unique divine role. Sri Guru Nanak Sahib compassionately accepted the loving offer of fresh milk from Bhai Dodha daily to the last day of his physical existence and continued accepting this physically for a long period thereafter though he was then physically not present in the world.