Many times there is more then one possible solution to a problem or an issue. People may not even agree on what the problem is.
Life is complicated, and different people see things in different ways.
But they still have to live together, and often they have to figure out how they can come to one conclusion even though they disagree. You are doing dialectical thinking when you have an argument with yourself about something in your head. You want to do something very badly. Dialectical thinking begins by understanding that most situations are complicated and often you want two opposite things at the same time. This is an introduction explaining briefly to your reader what the essay is about.