This is a piece of writing from Joymax Silkroad Online official site weekly best tips, the author is (Greece)Aisab

Title: Cleric healing guide

Objective:
Healing with no aggro.

Pros:
Being a tanker will feel secure that there will be constant healing while he tanks. Most of the time a stupid cleric will get aggro on himself which will result in healer running around and not healing. That leaves the tanker dead. This means the wizards will die if mobs are not tanked. And whole party will be disbanded eventually.

Healing skill that have no aggro:
Heal cycle. (the description says 150% aggro - it is bullshit)

Healing technique:
Here is how you should heal a tanker.
Always cast heal cycle on the tanker. (last 16 secs)
Do not cast any other spells on the tanker, heal cycle is enough. Prepare to use recovery if the heal cycle is not sufficient.

Recovery aggros, but usually when you use it on the tanker, he have already aggro the mobs around him enough for recovery not to aggro the mobs.

Healing other party members fast:
Other members maybe stupid enough to aggro the mobs around them. They will get hit and health will drop fast. It is impossible to select them and heal them fast enough.

Spells that do auto selection of lowest hp members.
Healing division. (auto instant heal that auto targets lowest hp members)
Use it like an instant heal to heal the other party members without even rotating your camera to look at them. (Take note that this will most likely aggro the mobs hitting your party member that aggro it)

After use heal division, prepare to run.
Due to heal cycle active on tanker, the tanker won't suddenly die with no healing. This will be able to last until tanker pulls the mob off you.

Conclusion:
There is no need for recovery division. Because it aggros the mobs.
Being a healer have to be on the constant vigilance on the tanker. There is no short cut.
If you just want to cast recovery division and go afk, I suggest everyone kick this type of useless healer out.

A good healer should always be on the alert. Cast bless when there is giant, and always refill the 16 sec healing cycle on the tanker.

Link: http://www.silkroadonline.net/sro_board/bhboard/bh_postview.asp?ForumID=3&TopicID=85635