The Mool Mantar is the most important composition in Sikhism, which is reflected in the fact that it is the opening text of the Guru Granth Sahib. Sikhs believe that the Guru Granth Sahib is the word of Waheguru so it is infallible.
The Mool Mantar (also spelt Mul Mantra) is the most important composition contained within the Sri Guru Granth Sahib, the holy scripture of the Sikhs; it is the basis of Sikhism. The word "Mool" means "main", "root" or "chief" and "Mantar" means "magic chant" or "magic portion".
Together the words "Mool Mantar" mean the "Main chant" or "root verse". It’s importance is emphasised by the fact that it is the first composition to appear in the holy Granth of the Sikhs and that it appears before the commencement of the main section which comprises of 31 Raags or chapters.
The Mool Mantar is said to be the first composition uttered by Guru Nanak Dev upon enlightenment at the age of about 30. Being the basis of Sikhism it encapsulates the entire theology of Sikhism. When a person begins to learn Gurbani, this is the first verse that most would learn.
It is a most brief composition encompassing the entire universally complex theology of the Sikh faith. It has religious, social, political, logical, martial and eternal implication for human existence; a truly humanitarian and global concepts of the Supreme power for all to understand and appreciate.
This Mantar encompasses concepts which have been evaluated and proven over many eras (or yugs) and known to be flawless beyond any ambiguity what so ever. The rest of Japji sahib that follows this mantar is said to be a elaboration of the main mantar and that the rest of the Guru Granth Sahib totalling 1430 pages, is a detailed amplification of the Mool Mantar.