Add to ORKGScience is defined as systematized knowledge of any kind that reflects a precise application of facts or principles. Viewed in this light Guru Nanak's life was a continuous process of scientific experimentation and enunciation. In this article, an attempt is made to bring out the scientific temper and the application of the methodology of science in guru Nanak's life. Scientific methodology is defined as a mode of research in which a problem is identified, relevant data gathered, a hypothesis formulated and then empirically tested. The hypothesis that God alone Is, is an ancient tenet, tested and verified many times in mankind's history. However, it was given to Guru Nanak to prove this truth in the modern context