Guru Nanak Dev
Guru Nanaks teachings can be found in the Sikh scripture Guru Granth Sahib, as a vast collection of revelatory verses recorded in Gurmukhi.From these some common principles seem discernible. Firstly a supreme Godhead who although incomprehensible, manifests in all major religions, the Singular Doer and formless. It is described as the indestructible (undying) form.Nanak describes the dangers of egotism (haumai I am) and calls upon devotees to engage in worship through the word of God. Naam, implies God, the Reality, mystical word or formula to recite or meditate upon (shabad in Gurbani), divine order (hukam) and at places divine teacher (guru) and gurus instructions) and singing of Gods qualities, discarding doubt in the process. However, such worship must be selfless (sewa). The word of God, cleanses the individual to make such worship possible. This is related to the revelation that God is the Doer and without God there is no other. Nanak warned against hypocrisy and falsehood saying that these are pervasive in humanity and that religious actions can also be in vain. It may also be said that ascetic practices are disfavoured by Nanak, who suggests remaining inwardly detached whilst living as a householder.