Every one of these professes to be competent to try his neighbour’s spirit, but no one can try his own, and what is the reason? because they have not a key to unlock, no rule wherewith to measure, and no criterion whereby they can test it; could any one tell the length, breadth, or height of a building without a rule? test the quality of metals without a criterion, or point out the movements of the planetary system without a knowledge of astronomy? certainly not: and if such ignorance as this is manifested about a spirit of this kind who can describe an angel of light, if Satan should appear as one in glory?