Musar zu Schemuel I 1:19

This is why the Torah says: והאדם ידע את חוה אשתו, "man knew his wife Eve." We find a similar description of the union of Elkanan and his wife Chanah, a holy union which resulted in the birth of the prophet Samuel (Samuel I 1,19). Just as the emanation יסוד is the link between the "junior" emanations תפארת and מלכות, through the covenant of circumcision, so “כתר represents the link between the "senior" emanations חכמה and בינה. The inseparable bond between G–d, Torah and Israel is forged in this manner. I have written on these concepts elsewhere at greater length, and will come back to them later.