What do you think the realest of understanding comes from?
The simplest things (which are at the same time the most intricate):
When I see a plant surviving in a concrete jungle
Watching a bird soaring on wind currents
The feel of the wind against your skin when you're standing on a plain in the middle of nowhere
Watching nature destroy and save what she sees fit
When I cry from absolute joy and an overdose of how beautiful our world is
When I get bitch-slapped right left and center by the universe for taking things for granted
So I'd have to say, when you put aside the objective and the subjective, let go of fear, let go of the need for logical explanation and simply be - understanding comes from an indefinable place deep inside yourself when you feel simple pure joy and happiness.
Note: and "realest" is ENTIRELY subjective and NOBODY can tell you what's right or wrong. There is no "realism" as such that we know of as fact. My realism is my own, your realism is yours. Accepting that there are no ultimate answers and that most of our lives and understanding thereof is a huge mystery, is what makes life so wonderful for me, and so scary for others.
Even "understanding" is a problematic word for me ... my subjective experience allows me to interpret and believe what is comfortable for me now, what i may believe tomorrow or in the next 10 years may very very likely change drastically. "Understanding" it all is a bit irrelevant to me at the moment.