Martinez de Pasqually Letter of 2 September, 1768
It is the month of September which guides us. We have from the first quarter to the full to work; that is to say, by beginning four to five days before the full.
As to keeping your spiritual obligations, you will personally recite the Office of the Holy Spirit the Miserere Mei and the De Profundis, once a week, which is Thursday, as the sign and day of Jupiter, even as David used it for his reconciliation, which I will teach you in due order. When you have experienced the value and force of this prayer you will recite the Office of the Holy Spirit at the same hour of the day. I do not limit you but for the Miserere Mei and the De Profundis you will recite them at night before sleeping; the De Profundis with the face against the Earth and the Miserere Mei with the face towards the Orient [East]. You will be wholly anticipated upon the points about which you inquire as touching our work and your eight days; or, at the start, candles will also be fully forwarded. The mode of placing the wax candles will also be fully forwarded. You will purchase a small ritual that you may have the prayers, benedictions and exorcisms, which I will indicate for you at the conclusion.