Yes, we need to know where exactly we want to go. I am applying it also in my life. I do make plans and time frame if I want to achieve something. I set my goals and I will do my best to reach it. But at one point, I wasn't getting my set plans anymore and trials come, to the extent I want to give up. And as they say, there is rainbow after the rain. Lesson learned: A man's heart plans his way, But the LORD directs his steps (Proverbs 16:9)