Iceland is an island of fire and ice. Icelanders are a bit like that too. We might speak less than we think.
Ari fróði said: let us have the version that proves to be truer – hafa skal það sem sannara reynist.
Perhaps this was his way of saying that he left out some things he knew to be, when he wrote our history.
Perhaps it was dangerous to tell the true version of what happened in Iceland.