“The most merciless thing in the world ... is the inability of the human mind to correlate all its contents.”

I guess it all depends on hou you define merciless.

It appears Mr. Lovecraft can not make up his mind. ie: refer to previus quote. I believe the most Merci-less thing in the world is the refusal or inability to Forgive.

Being a little "too" aware can, I suppose, drive you nuts! (Are those bats flying around in here again?) :)

The quote is incorrect. It should say "merciful", not "merciless". In the context of the story from which it comes, he's saying that ignorance is healthier than some knowledge.

This is only half the quote -- the other half repeats the phrase with 'merciful' instead of 'merciless.'