What it does
I'm not familiar with "Secrets of the Soul" as an official Magic: The Gathering keyword or ability. It doesn't correspond to any standard rules term I can verify, and I don't want to invent mechanics or rules nuances that could mislead you during a game.
It's possible this is a card name, a flavor name for a triggered ability on a specific card, a homebrew/custom card, or a misremembering of another keyword (like Surveil, Connive, or a "secrets" themed mechanic). If you can share the exact card or where you saw the term, I can give you an accurate breakdown of what it does, the rules nuances people get wrong, and how it plays in Commander.
For trustworthy rulings, I'd also recommend checking the card's Oracle text on Gatherer or Scryfall.
Iconic cards with Secrets of the Soul
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