大毘盧遮那成佛經疏 20.10

20.10

第七名溫腹。如上世間火中，謂是身內之火能消化食物資身也。此正法中義則不爾，腹內之火即是內證之智也。迅疾，謂其形更加忿怒，又甚於前也。極忿，謂作此噁字也。有種種色，謂形具五色也。義准前。

The seventh is named Warm Belly (Jaṭhara). As in the worldly fires mentioned above, it refers to the fire within the body that can digest food and sustain the body. In this true Dharma, the meaning is not so: the fire within the belly is the wisdom of internal realization. 'Swift' means that his form is even more wrathful, exceeding the previous ones. 'Extremely wrathful' refers to forming this syllable AḤ. He has various colors, meaning his form is endowed with five colors. The meaning is inferred from the previous ones.