Create a major premise in your introduction. For example, all stars shine.
Describe in the body of your essay the qualities that make a star shine. Point out any information that contributes to the fact that stars are shining. This section includes a general observation, minor premise or particular observation.
Generate a persuasive conclusion by backing your major premise up with facts. If the facts aren't logical, then you haven't written a logical essay. For example, the fact that we can see the stars surely indicates that they are shine.
Add all facts that are relevant for a logical argument. For example, explain how a star shines. Suppress any argument you anticipate. For example, a person could say that stars were once shining, but now they have burned out and we are just seeing them now. Qualify in your essay that the light from the stars that is just reaching the Earth proves that stars shine.
Make a statement in your conclusion that the North Star is a star and, therefore, it must be shining. A logical essay is like a mathematical formula. Though it doesn't have to be reasonable, it does have to be logical. For example, all people are 7 feet tall. I am a person, so I must be 7 feet tall.