Clear goals in a lesson plan allow for a sense of direction and purpose. Having a sense of purpose is what humans live for... it is what drives us to continue our pursuit of life. On a smaller philosophical scale, clear planning allows us to understand the road we are walking, and that it will lead us somewhere - just enjoy the scenery along the way.
Being given immediate feedback is important to knowing we're walking down the right road, and haven't taken any wrong turns or, if we have taken a wrong turn, it guides us back to the correct path. We would never dream of setting out to a new location without some way of mapping our progress, and knowing where we are and where we need to be. Immediate feedback does this for us in our lessons and learning. It allows us to focus more on the task, and keeps us on track.
Focusing on the task, with a clear idea of the point for departure, a point of arrival, and which turns to take along the way... well, it's like having a GPS guide you in the car. You can concentrate on driving, wothout needing to consult the map or stop and ask for directions. You know exactly where to go, and there is no fear that the GPS will lead you astray. The GPS only communicates what you need to know, at the time you need to know it. A well laid-out plan instills trust.
If you're involved in a lesson that totally swallows you up... you disappear into a total focus of the task, with no distractions and no awareness of any other concious existence... that's when time has no meaning. Time is a human invention, and doesn't exist outside the realms of consciousness and science. So, if we can remove all conscious distractions and provide a clear and determined goal with the steps for achieving that goal, then time ceases to exist. Our mind uses all of its processing power to deal with the challenge in front of us, without the need for measuring the speed at which we are processing information.
When I was a young man, I used to distract myself from the life I disliked by going fishing. As I reflect on how I spent my time while I was fishing, I have come to realise that it was autotelic... fishing for the sake of fishing. I wasn't disappointed if I didn't catch a fish, nor was I ecstatic when I did, in fact I often would return the fish to the water. I was fishing in order to teach myself how to fish. Catching a fish was an indication that I was succeeding in my lessons; not catching a fish was an indication that I needed to change my strategy.
I remember watching a man downstream from me one day, while he was fly fishing. The graceful moevment of the line as he cast and retrieved, then cast and retrieved it again, until he was able to make the fly land in the perfect spot on the water. The skill and accuracy, and the grace with which they were combined, was what I wanted to learn. I taught myself how to do what he did, through observation and practice. I don't know how long it took me to do that, but I perfected casting a line onto the surface of the water until it would land exactly where I wanted it to, every time. I recall being so absorbed in the learning process that, once I did get a distraction and notice the time, I was often late for supper and received a scolding from my mother that I was so air-headed not to keep track of time. That is 'flow'... that is learning.