A fly is an irritant to you. It carries disease, you have been told. Then why does it exist at all? Each creature on earth serves a purpose, or it would not exist. You swat the fly or shoo it away. Do others do the same to you, seeing you as an irritant?
You serve a purpose as well. Billions of humans walk the earth, and each of them serves a purpose, else they would not be here. You are part of the miracle of Life—one of the chosen to be here as a human instead of as a fly. So highly evolved are you that you can reason and make choices that a horse or dog cannot.
All creatures have the capacity to love. Only the human makes the choice to give or withhold love. Only the human makes a choice to be a deliberate irritant. How very lucky you are. Will you spread your wings today and fly or be an irritant?
The next time you see a fly, thank it for the lesson.