Holy Concentration

From wow.incgamers.com

Talent: Holy Concentration
Effect: Gives you a % chance to enter a Clearcasting state after casting any Flash Heal, Binding Heal, or Greater Heal spell. The Clearcasting state reduces the mana cost of your next Flash Heal, Binding Heal, or Greater Heal spell by 100%.
Statistics: Rank 1 = 2%, Rank 2 = 4%, Rank 3 = 6%.