When you heal a creature with positive energy (such as by channeling positive energy to heal the living, using cure spells, or using lay on hands), any affected creature at full hit points (whether already at full hit points or healed to full hit points by your channeled energy) gains a +1 sacred bonus on attack rolls, skill checks, ability checks, and saving throws for 1 minute. If you channel negative energy to heal undead, this is a profane bonus rather than a sacred bonus.
