“Thinking is the hardest work there is, that is why so few people engage in it.”
Henry Ford
What we are talking about here is clear thinking. Clear thinking is not easy. You need to be able to observe facts and have the discipline to draw conclusions while avoiding contradictions. This requires you to develop mental habits to help you think rationally and not emotionally.
We also want to think “good” thoughts. Thoughts result in actions, so when we focus our thinking on good and positive thoughts, our actions will mirror our thinking. The following link includes a powerful short book called “As a Man Thinketh” by James Allen.