"What most human beings really want to attain is not knowledge, but certainty. Gaining real knowledge requires taking risks and keeping the mind open—but most people prefer to be reassured rather than to learn the complex and often unsettling truth about anything.

In this statement, the speaker claims people will get real knowledge while they are open-mind and full of courages. However, they often maintain the status quo rather than take chance to get more truth.

It is true that to get or discover something should take some risks to us, even, these knowledge could force us to change or break the given knowledge. For example, in 14th century, Copernicus proclaimed Sun at the center of universe. However, this statement endangered the Holy that supported earth at the center of universe. He never gave up his findings even he was treated as a traitor of Holy. The contemporary astrology depended upon Copernicus' findings.

Another example illustrates that we do need courages to gain new information. Some people reported superstitious experience they encountered. In the past, superstitious experiences were associated with religious events. However, those could be evidenced by scientific research. Some scientists believes those are caused by our brain.

Yet, it's not to say people don't want to face the truth. People will feel confused and conflicts with their given experiences while new reality are discussed. Sometime, we will refuse to accept new truth for surviving. Besides,someone could make sure these changes is better and safer to us.

To sum up, I agree that people need more time to get new truth after giving more promises. We will imagine some terrible consequences after changing besides of some guarantee from someone about the future. Therefore, comprehensive illustrations are very important and necessary after we present new truth.