They believe they can tame the markets and know the unknowable.

他们自视甚高，认为自己能征服市场，而且无所不知无所不晓。

youdao

Life is the unknown and the unknowable, except that we are put into this world to eat, to stay alive as long as we possibly can.

生命是莫测的，是不可知的。我们来到这个世界，就是为了吃，为了活下去，尽可能多活些日子。

youdao

To blaspheme the earth is now the dreadfulest sin, and to rate the heart of the unknowable higher than the meaning of the earth!

现在最可怕的罪过是亵渎大地，将‘不可知’的心置于高于大地的意义的位置！

youdao

He says the results of using these new technologies are destructive because of the unknowable effects.

VOA: special.2010.12.15

but that is ultimately the Welles theme,isn't it? The unknowable-ness of an individual.

VOA: standard.2009.12.17

But focusing on the known, instead of the unknowable, sounds like a good idea.

FORBES: SocGen's Grice Says Laugh, And Maybe Buy Some Stocks

Making each picture was like throwing a stone without knowing where it would land, how close to the unknowable and unreachable.

ECONOMIST: Avigdor Arikha, painter of life, died on April 29th, aged 81

Rest in the consolatory rhythms of hearth and home, marked out by meals and seasons, or break the pattern and take the unknowable risk?

NEWYORKER: Ring Cycle