At the beginning of the spiritual revelation we feel that the Creator is giving us perfect bliss, but that we are incapable of giving anything back. More than anything, we want to overcome the shame that we feel toward the Creator, and bring Him some sort of pleasure.
It is like a person who is suffering from an illness. First he must discover how ill he is and that he cannot heal himself but by turning to a physician. Once he has done that, he is given a medicine and begins to heal, until he attains health and happiness. Only then can he appreciate the greatness and the kindness of the physician.