Theory:

Once there lived a farmer in a village. The village was in the hills, with a forest nearby. The farmer had a farm, where he produced many kinds of vegetables and fruits. One among such trees was the apple tree. The apple tree had been there since the farmer was a young boy. During his childhood, he and his family had enjoyed tasty apples from the tree. As a small boy, he had played hide and seek under the tree with his friends. They climbed and swung on the tree apart from plucking apples during the harvest season.
 
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The farmer's family had enjoyed the tastiest apples from the tree!
  
The small boy grew up and became a farmer. He started farming in the land by himself. Not only did the farmer enjoy the fruits from the tree, but many small animals and birds also started living in it. Like how the farmer had played there in his childhood, his kids were playing around the tree now. The huge tree was getting older. It did not bear many fruits anymore. The shade under the tree was cool, and it was nice to sit there during summers. But fruits did not grow. The farmer felt that space could be occupied to grow some vegetables instead of wasting it for an old tree. He also made plans to use the wood from the tree to build another room in his house.  He decided to cut the tree, but he did not think about the wonderful memories he had with the tree - how he had played around the tree with his friends and how they enjoyed the delicious apples. He only felt the tree had finished its time of usefulness, and it should be cut down now.
 
The farmer decided to cut the tree, and he brought his axe. The small birds, insects and animals that were living in the tree all came down immediately. They were frightened, and they started making  noises everywhere. But the farmer did not give up he continued his work. He lifted his axe again to cut the tree, and the noise increased. It seemed like the birds and animals protested against the action of the farmer.
 
The farmer did not remember his childhood or his friends. He began to cut the tree with more force. The animals and birds were all helpless and did not know what to do to protect the tree, which was their home. The frightened birds and animals ran around in circles making a huge noise.
 
Hearing the sounds outside, the children came out. The farmer's daughter and her friends used to play around the tree.
 
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The farmer's daughter used to play around the tree with her friends!
  
She and her friends began to request her father to stop cutting the tree. They all gathered around her father and pleaded not to cut the tree; they told him that they played there, just like the farmer did when he was young. They further questioned the farmer as to where the small animals would go if he cut the tree. They told  him that still, he could enjoy the shade of the tree even if he became old and that it was a beautiful tree.
 
Suddenly the farmer saw a small fruit hanging from a branch. Yes, it was an apple, and it looked as delicious as the apples he had eaten during his childhood. He plucked it from the tree and tasted the juicy fruit. All his childhood memories came back to him quickly. His face expression changed. The daughter who was seeing all this, requested him again, with more force.
 
The farmer decided to let the tree remain - he put down his axe. He realized that the tree served as a home for many animals and birds; he realized that it provided space and shelter for them. He felt his daughter should also enjoy the childhood fun that he had enjoyed. He threw away the axe and promised his daughter that he would never cut the tree; he also said that his daughter and her friends will always have the tree as their playground, as they always played around the tree.