Sikhism's principal scripture, the Gurū Granth Sāhib, starts with the figure "1", signifying the unity of God. Nānak's interpretation of God is that of a single, personal and transcendental creator with whom the devotee must develop a most intimate faith and relationship to achieve salvation. Sikhism advocates the belief in one god who is omnipresent (sarav vi'āpak), whose qualities are infinite and who is without gender, a nature represented (especially in the Gurū Granth Sāhib) by the term ik ōaṅkār.