380. It is because of the correspondence of the heart and blood with love and its feelings, too, that blood is red. There are all kinds of colors in the spiritual world, with red and white as the primary ones and the rest deriving their characteristics from these and from their opposites, which are a dark, fiery hue and black. Red corresponds to love there, and white to wisdom.

The reason red corresponds to love is that its source is the sun's fire; and the reason white corresponds to wisdom is that its source is the sun's light. Further, since love corresponds to the heart, blood needs to be red and to point to its source.

This is why the light is flamelike and angels wear reddish-purple in heavens where love for the Lord predominates, while the light is clear and angels wear white linen in heavens where wisdom predominates.