Likutei Moharan 53:2/ליקוטי מוהר"ן נ״ג:ב׳

12. The only way for a person to complete his daat, so that his daat is whole, is by means of his active involvement with people to bring them closer to the service of God. Through this his daat becomes whole. For they sharpen his daat, in the aspect of “but from my students, more than them all” (Makkot 10a). This is the reason [one’s] students are called [one’s] children, for through them comes the ability to have children.

2This is why Avraham and Sarah made such an effort to enlist converts, because through this they completed their daat and drew close to this heh—i.e., to the daat of God—and so merited having children. For through the converts, their daat expanded, in the aspect of “but from my students, more than them all.”

3But someone whose daat is not whole, so that he is far <even> from human daat, and certainly from the daat of God, which is the aspect of heh, he is <in the aspect of> a child and cannot bear offspring.

4This is the reason the tzaddikim work so hard and run after people to bring them closer to serving God. This is not so as to increase their [own] glory, God forbid, but to complete their daat, in the aspect of “but from my students, more than them all.”

5This is why the tzaddikim have the power to grant special providence to barren women, for they are whole in daat and close to the Upper Daat, so that there is nothing separating their daat from the daat of God other than five things, as explained above. And five things—this itself is the daat of God, from which comes the ability to have children.

6This is the explanation of: Three things broaden a man’s daat—a beautiful wife, a [beautiful] home, and [beautiful] furnishings (Berakhot 57b) .

7a wife—That is, the corporeal, <which is> called “a wife.” A person should be temperate in his corporeality, with a balanced temperament so that he is suited for receiving intellect.

8a beautiful home—This is the fear of God. As in the teaching [of the Sages]: Woe to the one who has no home (Shabbat 31b). For a person should ensure that his fear of God precedes his wisdom.

9and beautiful furnishings—These are fitting students to receive from him.

10When a man has all these preparatory elements, <they broaden his daat—i.e., his daat becomes whole, as explained above>.