In Hasidism . . . the word dabek, "cleave," means more than simply remaining close. Dabek has the same Hebrew root as the word d'vekut, arguably the goal and fulfillment of Hasidic spirituality. Usually translated as "cleaving," "intimacy," or "staying attached to," d'vekut is nothing less than a fusion with God, a loss of the self in the enveloping waters of the Divine, the unio mystica, a kind of amnesia in which we temporarily lose consciousness of where we end and begin, a merging with the Holy One(ness) of all being.
— Lawrence Kushner, Nehemia Polen, Filling Words With Light