.....
The question about the passage in Matt. 18 (and others like it) was something I came up with (and have always had difficulty understanding.)
humbly or unhumbly (me) remember "no man can receive anything unless the Father grants it"
as i kept seeking His Will, by faith and grace in Yahshua HaMashiach (Jesus Messiah), He very slowly and gradually separated me from all the dross, errors, and inaccurate teachings of men's doing. it hurts a lot when He does this, and it is required of anyone seeking Him (separation from sin/error/falsehoods).
i had choices all along the way (my life) to 'settle' for what men had in order to be more comfortable (with any particular group of men), but could not do so with a clear conscience before Yhvh (remaining in error on purpose seers the conscience, doesn't heal it) from Whom is all life and truth.
men who want to continue in truth (to abide in Yahshua) may continue, praying "in His Name" and "in union" with Abba (amazing grace! look up "in union" in Scripture --- true union with the Creator and the Savior of men; true union now, real time) and they (men who want to continue in truth in Yahshua).
i had a similar experience, long, revealing truth in a profession(medicine) i studied in for years and practiced in for years -
little by little, a little here, a little there, as truth came to light, (sheer grace, not just to hear it, but to be able to accept it),
in pure simplicity (and testable - anyone who tests the truth discovers its true; vs untestable - what men say- testing it proves it wrong, even though all men say it)
which brings me back to what you said
"...(and have always had difficulty understanding.)..."
as just like with posters here, some will agree, some will disagree, some will understand, most won't understand.....
i couldn't understand Yhvh's Word (Scripture) as long as i was still as i had been brought up, and in regular man's 'church' 'in the flesh' thinking. (the way of men) (the way taught by men)
oh, 'it' (man's way) was all put together in a big system that seemed fine, and people even seemed to be happy or have it all together so to speak,
but 'it' didn't pass the test. and little by little as understanding was granted by the Father, Yhvh's Word (Scripture) always passed the test - always true. no matter how much Yhvh's Word is tested, how often Yhvh is tested, He is true. Yhvh is Perfect. Yhvh is Faithful. men are not.
the long story short --- man's way(s) won't provide life. Yhvh does.
man still claims to(find,have,or provide the way of life) , even when man falls short,
and most men 'settle' for what man says. Yhvh lets them.
some men keep on seeking for truth. Yhvh lets them.