This, then, gives us at least an intelligible working hypothesis of the rationale of the Bible Promises. The measurement of their fulfilment is exactly proportional to our belief in them, not from any unintelligible cause, and still less from any unreasoning feat of a capricious Deity, but by the working of an intelligible Law. If any of my readers happens to be an electrician, he will find an exact parallel in what is known as Ohm's Law. Such readers will be familiar with the formula C = E/R, but for the benefit of those to whom this formula may be unintelligible, I will give a few words of explanation. C means the current of electricity which is to be delivered for any work that is to be done. E stands for the Electro-motive force which generates the current; and R is the Resistance offered to the current by the conductor, such as the wires through which it flows. If there be no resistance, the full amount of current generated would be delivered. But without any conductor no current could be delivered, and therefore there must be _some_ resistance, and so the full power of the Electro-motive force can never be delivered by the Current. The amount that will be delivered is the original power of the Electro-motive force divided by the Resistance. The Resistance therefore acts as a restricting force, limiting the extent to which the power of the original Electro-motive force shall be delivered at the point where the work is to be done, but at the same time no delivery at that point could be effected without it; so the Resistance also has a necessary part to play in the working of the circuit. Now if we want to translate the formula C = E/R into terms of spiritual force we may put it thus: E stands for the limitless Potential of the Eternal Spirit; C stands for the current flowing from it; and R stands for the localizing quality of our thought. We cannot entirely dispense with this localizing quality, for our whole purpose is to transmute the _unlimited_, undifferentiated power, which subsists in the Eternal Substantive of Spirit, into a particular differentiated mode of action, which therefore implies a corresponding centralization. This is the proper function of our thought. It is this compressing power which, as I said above, the Hebrew renders by the word "_hoshech_" in the opening verses of Genesis, and which is the necessary complementary to the converse expanding power or "_rouah_." It takes the co-operation of the two to produce any results.