Example sentence. Educators often subscribe to the banking concept of education. Analysis. To determine if this sentence is common knowledge, ask yourself, “Who is my audience? What do they know about my topic?” If your audience is educators who are familiar with Paulo Freire’s metaphor of students as containers that education fills with knowledge, then this statement counts as common knowledge and no citation is needed. If your audience is a general audience that might not know this concept and may mistakenly think it’s your own idea, then this statement is not common knowledge and you should provide a citation.