"You have to swear to me you not tell any one what I am going to say..." IF you agree, so you can hear what secret I am going to impart, you are bound, or a liar one of the two.
So; once again, for the umpteenth time, "Who asked you?" and WHY did they ask you?
God, through his officiator (the guy leading the ceremony, if you want the guy's name, get use to disappointment) Asks you. And they ask you because it is a sacred thing and it's part of the ceremony that only those agreeing to keep it sacred can continue with the ceremony.2.
a) God asks you. b) The ceremony is sacred and those who don't commit to hold it sacred are not allowed to continue, because that is how God wants it.3.
If I, or God or your sister won't tell you something, and you agree not to tell you are now bound by your word, or you are untrust worthy, period.You will now undoubtably say this is not good enough, but really, it is.
If I ask why I or God, or your sister, want some thing kept secret or sacred you have to ask them, I cannot ask you for you have agreed to keep it secret, capisce?