One only needs to read twentieth-century history to see that it has been the climax of human madness, if it's measured in terms of human violence inflicted on other humans.
Eckhart TolleIf you have a strong ego [and] something good happens to an acquaintance of yours, [it] makes you feel bad. It's called envy. ... The ego thinks something has been taken away from you because somebody else has received something good. It's a complete illusion, but that's the madness of the ego.
Eckhart Tolle