Within a few minutes of the opening of this scene, the betrothal is complete, and Miranda and Ferdinand's future has been determined to Prospero's satisfaction. The virtue and honor of these young people transcends the actions of their fathers and, in this betrothal, lies the redemption of their families. (According to Elizabethan custom, marriages consisted of three separate elements. The first was the betrothal, with it announcement of a promise to wed and the acknowledgement of the family's permission for the union to take place. The second part consisted of the wedding, with a religious ceremony that united the couple and bound them together under church law. The final part to the marriage was the consummation, the physical union of the couple through sexual intercourse.)
For the first time, Prospero can fully reveal his true nature. Finally, there is no need to be punitive or autocratic, and he can simply enjoy his daughter's happiness. For these few moments, the audience can witness what Prospero is like without the weight of revenge or control motivating his actions. Even in his gentleness and goodwill toward Ferdinand, Prospero does not forget that he is still Miranda's father, and as such, he is responsible for her until she is safely wed. Consequently, a significant amount of time is spent warning Ferdinand that he must control his lust until the wedding takes place. Prospero warns the young man that "barren hate, / Sour-eyed disdain, and discord," will be his reward if he cannot control his lust (IV.1, 19–20). All of this is in keeping with the expected parental role. Miranda is even more innocent than most young women, having had none of the socialization that other young women would experience. Because of her isolation, she is more vulnerable, and her father is aware of her purity of heart. However, he is also a father, facing the imminent loss of his only child, and so his excessive warnings to Ferdinand to control his lust are to be expected.
