At first reading, I perceive this line as continuation of the previous.
We (readers) are to help Nuit by being Hadit, who is her center and is secret because each one of us is Him and we don't know which one she is referring to (uhm, maybe this is too long a shot.. pls correct me if I am wrong);
The wording here does suggest a certain intimacy, and if we see this line as referring to Tiphareth, then I get that: being Hadit is accomplished with Knowledge and Conversation of the HGA (that is "falling in love head over heels" with the Angel). I think of the Sabbath, of the many tales sexual intercourse with disincarnate entities..
The reference to the heart is easily fitting Tiphareth, in its central position in the Tree, and its meaning.
I find more difficcult to place the tongue in Tipareth. I associate it with the throat chakra, communication, Yetzirah.. Well Tiphareth belongs to the Yetzirah group when we put the Four World on the Tree..
Is that enough??... uhm.. there must be more to it, but that's what I gather on my own.
I'll get back after digging the thread and commentaries..
A line in Eshelmann's comment made me think:
If “Nu” is treated as a Latin word, it appears as a Fourth Declension noun, though admittedly atypical: Nu, Nus. “Heart of Nu” is, therefore, Cor Nus
Cornus is latin for horn: the horns are often seen as phallic symbols, for their shape and the virility of the horned animals. I think this happens in English as well with the word "horny".
This is consistent with the message of being Hadit, and is another hint to these Sabbatic intercourses that I was mentioning..
I wish this makes sense!
I found very clarifying this part of the New comment as well:
Nuith selects three centres of Her Body to become "Two" with Hadit; for she asks me to declare Her in these three. Infinite freedom, all-embracing, for physical Love; boundless continuity for Life; and the silent rhythm of the Stars for Language. These three conceptions are Her gift to us.
These are examples of what to do to "be Hadit".
As always, they look very enjoyable at first sight, but they carry a big connection with responsibility and the habit of think for oneself. This is what I like most in Thelema, that it highlights the responsibility that comes from freedom and defines us as human beings.