Should there be a limit to the knowledge that someone has to prevent the abuse of others?

Since Prospero was learning of magic he was able to do things that he wouldn't have done such as enslave the people on the island. Or being able to survive the island because of the secrets Caliban had. Prospero was able to have more power, becoming corrupt because of the knowledge he learned.

Does absolute power always corrupt or can there be a way around becoming corrupt?

The character Prospero, shows how the magic he is now armed with is used to keep the inhabitants of the island under his power. He uses his power to manipulate and make what he perceives as good in his perspective be carried out even though it may not be good in the eyes of others.

Does how we act on our perspective decide between good and evil?

This can be seen in the scene when Caliban and Prospero are talking about Caliban being enslaved. Caliban thought what he was doing was justifiable because he, "showed thee all the qualities o’ th’ isle / The fresh springs, brine pits, barren place and fertile" (Shakespeare 1.2.403-405). Caliban saw that because he was sharing the island's secrets with Prospero it was okay to try to take Miranda, justifying it because of his perspective of the situation while Miranda and Prospero saw the act as despicable evil.

In this scene, Shakespeare uses the characters Antonio, Sebastian, and Gonzalo to exemplify how different mindsets in the same situation determine how people go from that point on. Gonzalo is trying to be positive with lines such as, "Can speak like us. Then wisely, good sir, weight / Our sorrow with our comfort" instead of the negative and joking mindset Sebastian and Antonio have (Shakespeare 2.1.8-9). While this is coming from the good of Gonzalo's heart it also needs to be taken with a grain of salt so they can prepare for the island appropriately.

At what point does a positive mindset become more harmful because of the unrealistic goals that will eventually let one down?

In Act 3 it shows the readers how much power can be obtained when you know, even if the knowledge is used for evil. This is seen through characters, but mainly focusing on Prospero. Conversing between the characters, Shakespeare conveys the theme through lines such as, "At nothing can be more. I'll to my book / For yet ere suppertime must I perform" (Shakespeare 3.1.113-114). This shows that Prospero's power comes from his books and with prior knowledge knowing that he used his power to strand other people on the island out of revenge. This can also be seen when Trinculo, Stephano, and Caliban plot to murder Prospero by weakening him before by taking away his books and, therefore his power.

Should people obtain knowledge so they would be more qualified of a leader to others even at the cost of the morality blurring?