So, in looking at this consciousness unfolding and these bodies becoming organised, we can trace throughout the purpose of that long unfolding—to make the Spirit master of matter, to enable him to act in every world; and when we catch a glimpse of that great purpose, we realise how perfect is the plan, how complete our triumph will be. First we notice, when we are looking at the lower forms of consciousness in ourselves, that we can understand a certain relation between matter and Spirit which we are told exists all the way up to the highest spiritual world. And so far as investigation has been carried by the students of to-day, they find that relation in each successive world that they enter and finally subdue. It is a relation, then, that runs right through between consciousness and form, between Spirit and matter; it is this: that every change in consciousness has a corresponding vibration in matter, and that every vibration in matter has a corresponding change in consciousness. We are told that that relation is imposed by the Logos Himself in His first shaping of the matter side of His universe; that all the vibrations of which He makes the atoms capable answer one by one to changes in His own consciousness, and that throughout the whole of His universe, in all the mighty realm of spirit-matter that He rules, this correspondence is universally, unchangeably found—for every change in consciousness a corresponding change in vibration, for every change in vibration a corresponding change in consciousness.