From !3th cent Japanese great Bodhisattva Sun Lotus (Nichiren)

“Again, this matter of the head being split into seven pieces—one need not imagine the kind of split made by a sharp sword. On the contrary, the Lotus Sutra says that the split is like that of the “branches of the arjaka tree.”

In a person’s head there are seven drops of liquid, and outside there are seven demons. If the demons drink one drop, the person’s head begins to ache. If they drink three drops, his life will be endangered, and if they drink all seven drops, he will die. People in the world today all have heads that have split apart like the branches of the arjaka tree, but they are so steeped in evil karma that they are not even aware of the fact. They are like persons who have been injured while they were asleep or in a state of drunkenness, and have not yet become conscious of their injury."