119. That 'Asshur' means the rational mind, that is, a person's rational, is quite clear in the Prophets, as in Ezekiel,

Behold, Asshur was a cedar in Lebanon, beautiful in its branches, and a forest shade, and of a great height, and its top among thick boughs. The waters caused it to grow, the depth of the water; made it tall, a river leading round about the place of its plantings. Ezekiel 31:3-4.

The rational is called 'a cedar in Lebanon'. 'The top among thick boughs' means facts in the memory, this being an apt description of them.

This is clearer still in Isaiah,

On that day there will be a highway from Egypt to Asshur, and Asshur will come into Egypt and Egypt into Asshur, and the Egyptians will serve Asshur. ¹ On that day Israel will be the third with Egypt and Asshur, a blessing in the midst of the earth, whom Jehovah Zebaoth will bless, saying, Blessed be Egypt My people, and Asshur the work of My hands, and Israel My heritage. Isaiah 19:23-25.

Here and in many other places 'Egypt' means knowledge, 'Asshur' reason, and 'Israel' intelligence.

Footnotes:

9557. 'There shall be three almond-shaped cups' means completeness so far as factual knowledge derived from good is concerned. This is clear from the meaning of 'three' as what is complete, dealt with immediately above in 9556; from the meaning of 'cups' as true factual knowledge derived from the good of charity, dealt with in 5120; and from the meaning of 'almond-shaped' as forms of the good of life that agree with the truths of interior natural good, dealt with in 5622. From these meanings it is evident that 'three almond-shaped cups' means completeness so far as true factual knowledge derived from good is concerned.