the apostle says that the gospel is a strong thing, a “power.” Power is of different kinds. There is material force. The powers of nature are of this order. There is muscular force, which is common both to brutes and men. It is higher than mere material energy, inasmuch as its exercise involves life and volition. There is mental force, the power of ideas, the might of reason. Who can conceive the greatness of this power? By its exercise man makes the forces of nature his servants. How mighty has
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