Every traveller on foot as a rule lights his torch at the approach of night. So also this heavenly traveller. Seeing darkness overwhelming Him in the lower spheres on His path, He lights a torch. It is the light of this torch, which is called in the Qur'an, Nur-e Mohammadi, that has guided Him to the surface, whence He could clearly discern and find His path back. To the knower's eye, this Nur, this light, is the real Mohammed. This light it is which has beamed forth through all the Masters of humanity and is known as the Light of Guidance.