WoWDB

Discipline:

When you deal direct damage with Penance, Smite, or Holy Fire you gain Evangelism. Stacks up to 5 times. Lasts for 20 sec.

Evangelism
Increases the damage and healing done by your Penance, Smite, and Holy Fire spells by 4% and reduces the mana cost of those spells by 6%.

Holy, Shadow:

When you deal direct damage with Smite or Holy Fire you gain Evangelism. Stacks up to 5 times. Lasts for 20 sec.

Evangelism
Increases the damage done by your Smite and Holy Fire spells by 4% and reduces the mana cost of those spells by 6%.