The bush was ablaze, but it was not burning up. Moses intuitively turned to look at the remarkable sight. As he did, God instructed him, "Put off thy shoes from off thy feet, for the place whereon thou standest is holy ground." Ex. 3:5.
The bush, untouched by the burning flames, illustrated the indestructible presence of Spirit. The holy ground upon which Moses stood—wasn't it the revelation that Spirit is the foundation of all true being? Through reverently standing on the holy ground of this revelation, Moses brought about the children of Israel's subsequent freedom from slavery in Egypt. Freedom comes to us all through the understanding that the foundation of our being is spiritual, not material.
Christ Jesus showed us so clearly the supremacy of Spirit. He stood on this holy ground, bringing freedom to those mired in the limitations of matter. He demonstrated that man is entirely spiritual. His healing works provided proof of the ever-presence of Spirit and the baselessness of matter.