Here's the idea:
There is a mod which gives you a fixed amount of life for every hit you make.
According to data mined from the beta, I see you can get:
max 657 life per hit from weapons and amulet
max 328 life per hit from rings.
I don't know if the mod from a 2nd weapon can stack with the one from the 1st weapon.
If it stacks, you can get up to 2627 life per hit (dual wield)
If it doesn't, you can get up to 1970 life per hit
We're talking about the possibility of reaching 30k-50k (maybe more) life healing per second while hitting stuff.
Isn't that RIDICULOUS?