If you desire an illustration of this principle, you need only put some green wood on the fire. When cold is brought to bear on a thick and dry substance, the colour which is produced will be black. The reason is that the substance is compact and very thick, and under the influence of cold which is destructive of life, the thickness causes obscurity and absence of light; and negation of colour is blackness. Thus you may accept it for an universal fact that a clear substance is a white substance. The efficient cause is not always the same; it is sometimes heat, and sometimes it is cold. But blackness and whiteness (as every one knows) are the two extremes of colour. Hence your work must begin with blackness, if whiteness is its final perfection. Red—as the Sages say—is an intermediate colour between black and white. Nevertheless you may believe what I say: Red


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