Guru Nanak stated that his Guru is God who is the same from the beginning of time to the end of time. Nanak claimed to be God's mouthpiece, God's slave and servant, but maintained that he was only a guide and teacher. Nanak stated that the human Guru is mortal, who is to be respected and loved but not worshipped. When Guru, or SatGuru (The true Guru) is used in "Gurbani" it is often referring to the highest expression of truthfulness – God.