"I envy you".
He stopped causing him pain and took his hand off of the ice dagger.
Sango robbed his palm with his other palm like he was wiping off the touch from having his hand on the ice dagger.
"Being able to feel pain and agony, it makes you feel alive. You get the feeling that you are not just a cold dead corpse".
Sango's body has abstained from pain and difficulty since he arrived in this world.
He has lot his purpose and reasoning as he no longer fears or regard anything highly due to him being guided by his rationality.
While his rational mind comes in handy as it helps him stay calm and cool to any and whatever situation he finds himself in, it also creates for a hole filled only with an indescribable thought.
"That is that. Here is my offer for you".
Before Sango could think too far, his rational state of mind was quick to kick in, thus sending away whatever doubts or emotions that was about to surface in him.