Thinking is work, and work is more profitable after some training. Great men do have great minds, and reading their works may strengthen our own mind. But we would not learn logic in a systematic way. Also, even great men make mistakes. We need to be able to recognize their mistakes.
Logic is foundational to the study of every other subject.
Learning to read is a basic skill without which students are crippled. Learning to think is just as basic. When I write an essay, I use logic to determine if my conclusion follows from what I ve written. When I study to give a report on Napoleon, I use logic to decide which historian has interpreted the evidence about Napoleon s life the most accurately. When I am studying the Bible, I use logic to pull together different statements in the Bible to deduce that God is sovereign over every area of my life.