If you AES the last line,
With a key made of something divine,
And then you XOR
The SHA-1 of "4",
FWqY58QhWVqPDX0uQ8C37AYaPeWFab42F2nyuY+zWK/gCV2bo8hIDt6sjon1I8+Y64RzJcCwlHIouiebHza67ErpHbVVWeZh4Pf8GBVtrDU=
Can you figure out what the "divine thing" is and then follow the instructions to determine what the keyword hidden in the last line of this limerick is?
Important hint:
The AES key is a word padded with null characters at the end to make it 16 bytes total.