sympathising with and swiftly grasping

[Mohammad Ali1]

Therefore, as a
child develops into an adult, the chances of those around them exactly
sympathising with and swiftly grasping their inner condition necessarily
decrease sharply.
Source" Good Enough Parenting by Alain De Botton
Question: This my understanding of above sentence: as child becomes an adult, the chance of sympathizing with (the child) and grasping his/her inner condition decreases sharply. Is it correct?

 

[cidertree]

"Therefore, as a child develops into an adult, the chances of those around them exactly sympathising with and swiftly grasping their inner condition necessarily decreases sharply."

Yes, I agree with your parsing of the sentence but I'm not sure how much sense I'd make of it.

 

[Chasint]

I think we need to know what "therefore" refers to. What was the previous sentence?

 

[Mohammad Ali1]

Thank you cidertree.
This is for Chasint :
For a start, one recognises that no one understands who one really is. That
isn’t entirely true, but the more complicated any human being is, the less
likely they are to be easily and immediately understood. Therefore, as a
child develops into an adult, the chances of those around them exactly
sympathising with and swiftly grasping their inner condition necessarily
decrease sharply