There is a well inside our house. Long drainage has been made by bricks to drain water from the front of the well. So Usually, hundreds of buckets of water are drained from this drainage every day. Garbage accumulates on the ends of the drainage,  Some of the garbage in front flows out, but the layer of garbage keeps falling on the bank, the interesting thing is that even if many buckets of water are released from one bank to clean the drain, then that water flows over the garbage and makes way through the part and leaves. Dirt remains as it is at the bottom of the drainage.

Our intestines are also just like this drainage.  At the time of defecation, we think that our intestines have been cleaned due to some part of feces coming out of them, when in fact; feces continuously stick to the edges of the intestines. That feces become hard and dry after sticking, new feces keep coming out from above. 

In our daily life, we can not clean our intestines deeply. Then these feces results in constipation. In the condition of constipation, the intestinal veins remain in contact with the dry feces sticking to them. Or say that new food does not come in direct contact with them. And, they are unable to extract nutritious and life-giving elements from that fresh food, thus inhibiting the natural functioning of the intestines.

In this way, the real purpose of getting life force from food becomes completely ineffective. Due to these feces sticking continuously in the intestines, every new food that comes in becomes rotten.  Gradually, the rotting of feces remains in the entire digestive system permanently. The expulsion of complete feces from the large intestine (rectum) is like a dream become true. There is always some excrement remaining in the intestine.