The deva asked,
What causes ruin in the world?
What breaks off friendships?
What is the most violent fever?
Who is the best physician?

The Blessed One replied,
Ruin in the world is caused by ignorance;
friendships are broken off by envy and selfishness;
the most violent fever is hatred;
the best physician is the Buddha.

The Gospel of Buddha (1894), a compilation of translations from ancient records.