A person does not receive fulfillment from the love itself but from the longing for love, from yearning for the one he loves. He is happy that he is experiencing these feelings without receiving egoistic fulfillment.
Therefore, spiritual action is performed through faith above reason, for the sake of bestowal. This is a different kind of Kli. It is the yearning that fulfills a person; it is the main thing, and therefore, it is necessary to grow it.
The same rule applies in our world: as long as we are yearning for the goal, it fulfills us much more than its achievement and the realization of our dream. Then we see that it turned out to be not what we imagined. But why is it so?
It is because, in fact, the nature of desires and fulfillments does not work in such a way. True and constant fulfillment is only possible from the yearning, not from the fulfillment of the desire. The will to receive was not created in order to be filled, but rather in order to develop above it the longing for love and bestowal.1
From the 1st part of the Daily Kabbalah Lesson 7/3/19, Deficiency For The Greatness of the Creator
1 Minute 16:55