A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
Daigotsu Gahseng's text says:
Reaction: After an action's resolution ends, if you discarded a Dark Virtue card as a cost or effect of the action: Put the Dark Virtue in your hand.
Are Dark Virtue I put in my hand need be same copy as Dark Virtue I discard as cost or effect (and react for this reason) ?
Like : I discard Paths of Honor and Glory for tactila action and want take back Insight from my discard pile.
Are Dark Virtue I put in my hand need be same copy as Dark Virtue I discard as cost or effect (and react for this reason) ?
Yes. In Gahseng's text, "the Dark Virtue" may only refer to the one Dark Virtue card that you discarded as a cost or effect of the action that has just resolved.