IO is the cry of the lower as OI of the higher.

In figures they are 1001;⁹ in letters they are
Joy.¹⁰

For when all is equilibrated, when all is beheld from without all, there is joy, joy, joy that is but one facet of a diamond, every other facet whereof is more joyful than joy itself.

     The Dragon-Flies were chosen as symbols of joy, because of the author's observation as a naturalist.
Paragraph 1 merely repeats Chapter 4 in quintessence; 1001, being 11S (1-13), is a symbol of the complete unity manifested as the many, for S (1-13) gives the whole course of numbers from the simple unity of 1 to the complex unity of 13, impregnated by the magical 11.
     I may add a further comment on the number 91. 13 (1 plus 3) is a higher form of 4. 4 is Amoun, the God of generation, and 13 is 1, the Phallic unity. Daleth is the Yoni. And 91 is AMN (Amen), a form of the Phallus made complete through the intervention of the Yoni. This again connects with IO and OI of paragraph 1, and of course IO is the rapture-cry of the Greeks.
     The whole chapter is, again, a comment on Liber Legis, 1, 28-30.

     (9) 1001 = 11S (1-13). The Petals of the Sahasraracakkra.
     (10) JOY = 101, the Egg of Spirit in equilibrium between the Pillars of the Temple.