This is true for us all and in every aspect of life. If we want to grow and develop any part of our being to be stronger and more effective or efficient, it will always require discipline. The law of entropy is not only a scientific fact, it is also a practical reality in every aspect of life and facet of our existence. The fact is that things left unattended tend to decay and decline, not improve and get better. If we do not intervene in the things of our life, it will move from more order to less order. Our bodies are deteriorating and that is a fact no one can avoid. However, if we put forth efforts to exercise ourselves in our diet and our cardiovascular exertion, we can slow down the process of decline a bit for a while. Bodily exercise profits the body for a bit, but to continue the benefit it must be repeated. Going to the gym one day will help for that day and perhaps the next, but eventually we will need to go to the gym again in order to continue to benefit our body. These same realities and principles are also true in our mind for our understanding of truth and in our spirit for our spiritual being. If we do nothing, we will not grow or make progress spiritually in maturity. We will actually decline spiritually or, in other words, backslide into more carnality. If we have any hope of being strong spiritually and developing more godly strength in our lives, we must exercise our spirit in spiritual matters. We must be disciplined in what we feed into our spirit, and we must discipline ourselves to do spiritual exercises that God will use to build our spiritual strength so we make progress spiritually instead of decline. No one is going to exercise physically without effort and discipline and the same is true spiritually. We must determine to exercise and follow through on our determination with actually doing the workout in order to benefit from it. We can take all of the supplements we want. We can waste enormous amounts of money to try to make it easy. We can listen to other people tell us how they achieved it in their life. But none of that will ever be as effective in actually being fit physically or spiritually until we make ourselves do what must be done to experience it in our life. We actually have to put forth the effort in order to gain the benefit. The best plan for physical fitness and spiritual fitness is just plain disciplining ourselves to exercise and feed ourselves a healthy diet. There is no easy way to do it, and that is why so many do not experience it personally physical or spiritually or both. So, we all have choices to make in life physically, mentally, and spiritually; either to exercise or decay. Work at keeping things orderly or let them fall apart.