Does temple of serenity now require you to have a spell in hand/equip it successfully?
Temple of Serenity and new equip rules
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.
Does temple of serenity now require you to have a spell in hand/equip it successfully?
Yes. Temple of Serenity now targets the Spell to be Equipped, so the Good Faith Rule requires you to have a Spell in hand which you can pay for and attach to the Shugenja you (will) target.