“The test of a first rate of intelligence is to have two opposed ideas at the same time and still retain the ability to function,” as claimed by Fitzgerald, the author of The Great Gatsby. Being the opposite of each other, certainty is to be absolute in one idea or belief, while doubt is to be uncertain. As history shows, it is preferable to coexist with these two opposed ideas since certainty gives one confidence, and doubt gives the contemporary laws, structure, or society a chance to improve. Certainty produces confidence, which encourages the minority to insist its ideas under the pressure from the majority. Inspired by his certainty of the wrongness of the Roman Catholic Church, Martin Luther nailed the 95 Theses to the gate of the Wittenberg