Part 3:
I forgot to add that these two different ways of relating to Hashem are actually two different mitzvos:
Mitzva 1 is to know Hashem – this is accomplished by thinking about Hashem’s Greatness in ways we can relate to based on our experience of our own chochma chessed etc. (You can only understand our relate to something within your experience. For example you can imagine an elephant in a subway because you know what the two are even though you haven’t seen both together. However someone who has never seen either can’t imagine both together.)
We use our knowledge of Hashem, which we only know by learning about it, to create love and fear of Him, another two mitzvos. Incidentally, these mitzvos are part of the 6 constant mitzvos which apply to women as well. Hence women have an obligation to try to understand as much as possible about Hashem to be able to love and fear Him.
The other mitzva is Believing in Hashem – separate mitzvah. This relates to what we can’t understand.
Interestingly, the Tzemach Tzedek points out that the more we learn about Hashem, the more we understand, and the more we realise what there is that we can’t understand. Ie we take things that were previously in the realm of emuna and now we understand it because we learned and thought about it. So now our yedias Hashem is greater, and our Emunas Hashem jumps to the next level.