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In Sikhism, God is conceived as the Oneness that permeates the entirety of creation and beyond. It abides within all of creation as symbolized by the symbol Ik Onkar. The One is indescribable yet knowable and perceivable to anyone who surrenders their egoism and meditates upon that Oneness. The Sikh gurus have described God in numerous ways in their hymns included in the Guru Granth Sahib, the holy scripture of Sikhism, but the oneness of formless god is consistently emphasized throughout.
God is described in the Mul Mantar , the first passage in the Guru Granth Sahib:
ੴ ਸਤਿ ਨਾਮੁ ਕਰਤਾ ਪੁਰਖੁ ਨਿਰਭਉ ਨਿਰਵੈਰੁ ਅਕਾਲ ਮੂਰਤਿ ਅਜੂਨੀ ਸੈਭੰ ਗੁਰ ਪ੍ਰਸਾਦਿ ॥ ikk ōankār sat-nām karatā purakh nirabha'u niravair akāla mūrat ajūnī saibhan gur prasād.There is only one God, and it is called the truth, It exists in all creation, and it has no fear, It does not hate, and it is timeless, universal and self-existent! You will come to know it through the grace of the Guru.