Theory:

This poem explains about the learnings we get from life. The first stanza speaks about friendship. The poets say that having a friend is like planting a flower. To grow plants, we carefully pour water, add manure to our plants so that it grows well.
 
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Having a friend is similar to planting a flower.
  
Similarly, we should cultivate friendship by showing love and kindness to all. If we continuously show love and kindness to all, one day, the flower of friendship will blossom. Friendship is compared to growing a flower in this stanza. Like how we grow our plants, we should develop our friendship with others.
 
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Growing plants are similar to cultivating friendship!
 
As we walk on the land that earth has given us, we should be conscious of all the small creatures that live here along with us. Even the tiniest ant needs its space on this earth, we cannot invade any other creature's space. The poet could have also implied to say that while we walk, we may stamp the tiny creatures like ants/insects. So we should be cautious to respect their homes and not hurt them.
 
What we learn from life is not simple. There are some hard lessons, and there are some costly lessons. Whatever we get in our life has a cost. For example, the education that we get today has a cost. Our parents spend money so that we get educated. Another example is the air that we breathe in, given by Mother Nature. It may seem free, but we should thank our nature and repay by planting more trees and by not destroying nature and her resources. Even if someone gives us a small gift, we should appreciate it and thank them. Even the smallest gift has a cost, as nothing is free in this world. We should not think that it is a small gift and it does not require thanks. We should respect each other and think of the other person - what the other person needs, what we can do to help them etc.
 
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Be thankful for even the smallest of gifts!
  
The poet says that we should remember that everybody around us is important. We should not forget anybody. All of us are equally important.
 
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All of us are equal.
  
When somebody forgets us, we feel sad. We should not leave out anyone. Consider everyone equal and equally important. We should also realize that all of us are important, and we make a difference to someone. If we are not there, it will make a difference. We should also realize our self-worth. We should not let anyone humiliate us or put us down. Nobody has the right to make us feel bad, nor should we make others feel bad.
 
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If we realize our worth, no one can shame us!
  
What we learn from life is not simple. There are some hard lessons, and there are some costly lessons. Whatever we get in our life has a cost. For example, the education that we get today has a cost. Our parents spend money so that we get educated. Another example is the air that we breathe in, given by Mother Nature. It may seem free, but we should thank our nature and repay by planting more trees and by not destroying nature and her resources. Even if someone gives us a small gift, we should appreciate it and thank them. Even the smallest gift has a cost, as nothing is free in this world. We should not think that it is a small gift and it does not require thanks. We should respect each other and think of the other person - what the other person needs, what we can do to help them etc.
  
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Say "thank you" for even the smallest of gifts!