Since you now appear certain to attain Buddhahood, perhaps the heavenly devil and evil spirits are using illness to try to intimidate you. Life in this world is limited. Never be even the least bet afraid! (WND, 1109)
Note: devil king of the sixth heaven ［第六天の魔王］ ( dairokuten-no-maō):
Also, devil king or heavenly devil. The king of devils, who dwells in
the highest or the sixth heaven of the world of desire. He is also named
Freely Enjoying Things Conjured by Others, the king who makes free use
of the fruits of others’ efforts for his own pleasure. Served by
innumerable minions, he obstructs Buddhist practice and delights in
sapping the life force of other beings.
