Patch 6.0.2 (October 14, 2014): Selfless Healer no longer causes Bastion of Glory to apply to Flash of Light. For Holy Paladins, it now increases the healing of Flash of Light on others by 35% per stack (up from 20%). For Retribution and Protection Paladins, the effect on Flash of Light remains unchanged.
Patch 5.4.0 (10-Sep-2013) Selfless Healer in addition to its current effects, now also causes Judgment to generate a charge of Holy Power for Holy Paladins. Stacks of Selfless Healer now reduce the cast time, mana cost, and improve the effectiveness of Divine Light, Flash of Light, and Holy Radiance.
Patch 5.2.0 (5-Mar-2013): Selfless Healer now boosts Flash of Light by 20/40/60% (was 33/66/100%).
Patch 4.2.0 (28-Jun-2011): Selfless Healer can no longer be dispelled and cannot be stolen via Spellsteal; and, in addition to its current effects, it lowers the cooldown of Word of Glory by 5/10 seconds.