For obtaining some grains, just as someone ploughs the field, someone else sows the seed and guards it, and when the crop is ready, somebody comes and reaps it. But it cannot be known who ultimately will eat that grain.
Just as someone digs the foundation of a house, somebody else lays the bricks and plasters it, but no one knows who would come to live in that house.
Just as before getting the cloth ready, someone picks cotton, someone ginns and spins it, while some other person prepares the cloth. But it cannot be known whose body will adorn the dress made of this cloth.
Similarly, all seekers of God hope and expect union with God and prepare themselves in all possible way for this. union. But no one knows which of these seekers would ultimately be fortunate to unite with husband-Lord and share the mind like nuptial bed.