Lately they took up the following habit:
anything and everything you wish to participate in requires you to swear on the Bible with approximately the following formula
"I swear in front of God, on my health and my future spiritual evolution, that I will not reveal the secrets I am about to learn/the details of this initiation that I will receive today, except for my spiritual leader and the other participants of this initiation. So help me God. Amen. Amen. Amen."