Why there is limited sharing in Buddhism I found there are lacking of Buddhism knowledge sharing in Temple or some close friends. The temple would rather be superstitious like worshiping, or more commercialize or like a tourism place. I was taught by one of my teacher that Buddhist needs certain level of credits or faith to study it. It was written in the Mahayana Sutra opening verse too. &quot;Is difficult to encounter throughout hundreds of thousands of millions of kalpas&quot; https://www.fgsitc.org/wp-content/uploads/2017/12/Ksitigarbha_Sutra_ChiEng.pdf .
My personal findings we are still following the Treravada traditional of teaching where Pali languange was a royalty, the kingdom officer or the rich spoken language so it's not easy to encounter. I think what I was meant by this statement
&quot;Is difficult to encounter throughout hundreds of thousands of millions of kalpas&quot;
Scholars consider it likely that he taught in several closely related dialects of Middle Indo-Aryan, which had a high degree of mutual intelligibility.
https://en.m.wikipedia.org/wiki/Pali
Does it a truth or where else Sutra mentioning that sharing of Buddhism shall be limited to certain people?
Teaching of the Dhamma (the teachings of the Buddha) to those who need it, by those who are qualified to do so, is considered the best gift anyone can give to others.
From Iti 100:

&quot;There are these two kinds of gifts: a gift of material things &amp; a
gift of the Dhamma. Of the two, this is supreme: a gift of the Dhamma.
&quot;There are these two kinds of sharing: sharing of material things &amp;
sharing of the Dhamma. Of the two, this is supreme: sharing of the
Dhamma.
&quot;There are these two kinds of assistance: assistance with material
things &amp; assistance with the Dhamma. Of the two, this is supreme: help
with the Dhamma.
&quot;There are these two kinds of mass-donations: a mass-donation of
material things &amp; a mass-donation of the Dhamma. Of the two, this is
supreme: a mass-donation of the Dhamma.&quot;

However, only those who can appreciate the Dhamma (teachings) should be taught it. There is no use trying to teach the Dhamma to one who cannot appreciate it.
From SN 9.3:

Now at that time Venerable Kassapagotta, having withdrawn for his
day’s meditation, tried to advise a tribal hunter. Then the deity
haunting that forest approached Kassapagotta wanting to stir him up,
and recited these verses:

“A tribal hunter wandering the rugged hills
is unintelligent, unthinking.
It’s a waste of time to advise him;
this mendicant seems to me like an idiot.
The tribal hunter listens without understanding,
he looks without seeing.
Though the teaching is spoken,
the fool doesn’t get it.
Even if you lit ten lamps
and brought them to him, Kassapa,
he wouldn’t see anything,
for he has no eyes to see.”

Impelled by that deity, Venerable Kassapagotta was struck with a sense
of urgency.

Furthermore, the Patimokkha, the rules for Theravada Buddhist monks and nuns, restricts teaching to only people who are respectful to the teacher - details can be found in this answer.
So, these are the limitations to sharing in Buddhism:

The Dhamma should be taught only by one who is qualified to teach it
The Dhamma should be taught only to those who can appreciate it
The Dhamma should be taught only to those who are respectful to the teacher