不生气口诀

Well, you know there is a Chinese poem name 不生气口诀, telling people not to get angry? o.O

人生就像一场戏
因为有缘才相聚
相扶到老不容易
是否更该去珍惜
为了小事发脾气
回头想想又何必
别人生气我不气
气出并来无人替
我若气死谁如意
况且伤神又费力
邻居亲朋不要比
儿孙琐事由他去
吃苦享乐在一起
神仙羡慕好伴侣

I wonder what's the history behind this little poem, because it seems to confirm the existence of Death Gods! Look at the part I bold. It reads, "死神", right? 死神 means Death God. :O