大毘盧遮那成佛經疏 20.7

20.7

The fourth is red like the radiance of the sun, dwelling within a triangle, holding a sword in his right hand, sitting upright; the sword represents sharp wisdom severing the fetters. Just as when the sun first rises in the world, night is removed and day appears, darkness is exhausted and light appears, this colour is adopted. The fire god has such form and colour, his blazing flames are likewise, and his bodily features are upright and full. As before, he abides in samādhi, displaying a slightly wrathful appearance.