Here's a breakdown:
* Profanation: An act that shows disrespect or contempt for something sacred or holy.
* Joys: This refers to something that brings happiness or delight.
Therefore, the phrase "Twere profanation of your joys" implies that something would be disrespectful and wrong to do because it would diminish or destroy the happiness or joy that someone experiences.
Example:
"To share your secret with someone else would be a profanation of your joys. It would diminish the specialness and intimacy you feel."
In essence, the speaker is suggesting that certain actions are inappropriate because they would disrespect the sacredness of another person's happiness or joy.