It is written in the Talmud that when one sees 600,000 Jews together, one should say a special blessing: “Blessed is the Wise One of Secrets.”
This is because there were 600,000 opinions and nuances of disagreement at Sinai, and no book could speak equally to all.
Concerning this, it was said (Numbers 27:15-23) that Moses demanded of God that He choose someone with the Divine Spirit in him to go about and explain the Torah to each and everyone.
Someone with a Divine Spirit being the one who can understand each and every person and thereby direct his explanations accordingly.
Two living persons can commune together.
One can teach the other by orienting himself to the other’s spirit.
If there is any barrier to their communion, such as a lack of understanding on the part of the listener, the speaker can adjust himself to the situation and overcome it.
Otherwise, he would not be fulfilling his role of teacher.
After all, what is the task of the spiritual guide?
Is it not to feel the state of mind of the listener, even while he speaks, and constantly take it into consideration?
The important thing is the act of comprehension, of genuine absorption.
True, only too often this is lacking between two persons who are close.
–Rabbi Adin Steinsaltz