That is because it is only when you take the human form and 'work consciously', that you are capable of ascending to regions higher than what the angels inhabit. The angels do not have the limbs and the body frame to 'act' and therefore they wait eagerly for being born on earth. In fact, the angel does not care whether it is born as a queen or as a servant maid, so long as it is privileged to be born as a human being. It is only 'proper action' on earth that releases you to wing your way to a higher realm. That is why the earth is called the 'karma bhoomi'. Whatever your station in life, you can make the best use of it to become aware, understand and become one with life.
This is not to suggest that one should not work for social and economic betterment, to bring about a just and equitable society. That work on the outside, however, should not hamper the work that has to be done on the 'inner', to be free of all prejudices, opinions, divisive tendencies, jealousies that one harbors.
It is when all these hindrances are removed that one catches a glimpse of one's original nature. Life's journey on earth involves quite a few troubles and tribulations for everyone, be he King or page-boy. Suffering and sorrow are the common lot of humanity. The one who is desirous of learning from life does not mind whether he is put into a palace or a hovel, because everything is only a 'learning situation'. Thus, if one is willing to accept all this as God's will, to enable him to understand intelligently all that is happening to him, and thereby dissolve the self, he will always be grateful to God, in fair weather or foul. The Sadhak or Sufi is content with God's dispensation under all circumstances and never loses his cheer.
Abu Sayyeed now turns it round and says, that one may be called a Sufi if God
is willing to be satisfied with whatever that man does. Love of god,
devotion and surrender are the qualities which please God, above everything
else. Now, that such a devotee is an instrument of God, he does only 'His' work,
at His behest. In such a case God cannot ask for more from his instrument. If
the instrument completes a given job, God is content and thereafter lays the
instrument aside, till such time that he needs it again for another job. And
even without doing any specific work, the 'instrument' goes on spreading love
and harmony all round, affecting all those who come near 'it', and turning their
faces towards God!