One of the main themes in "The Tempest" is the consequences of the uses and abuses of power. Prospero has accumulated and lost a great deal of power in his life. For this reason, and because his brother is also power-hungry, Prospero and his daughter Miranda have been banished to an island. Prospero's only remaining power is controlling the weather and the other inhabitants of the island: his daughter, his faery servant Ariel, and the monstrous Caliban. As the play progresses, Shakespeare depicts Prospero as increasingly weary of using his powers; he wants now only to make certain that his daughter has a future. He contrives a shipwreck and stages a meeting between Miranda and a suitable husband. After all turns out the way he planned, he yields his power to the future and returns home.
As it is the last work of the dramatist, Shakespeare treated his own professional life as the central theme for his play. The magic wand of Prospero is really the pen of the playwright with which he had made all the brilliant plays. Another theme of the play is sin and forgiveness. Prospero, a lover of books and philosophy, lost interest in his dukedom. He allowed his dukedom to be userped by his brother Antonio with the connivance of Alonso, the king of Naples. The play treated the themes of sin, atonment and reconciliation through the incidents in the deserted island.Prospero thought not only of his revenge but also about the well future of his daughter Mirinda. Prospero practiced the purgatorial trial of some kind to avenge his enemies. Put his enemies in trial of strong feelings. Alonso's mind is purified with the trail of giving pain of his own son's death. Even his daughter's love is testified.