As you sow, so shall you reap
Nature never leaves you empty-handed.
There was a farmer named Fleming in Scotland.
One day he heard a call for help. He saw a boy sinking in the quicksand. Fleming pulled the boy out of the quicksand; he affectionately patted him and told him to go home. Then, he returned to his farming job again.
Next day, a well dressed gentleman arrived at his hut. "You saved the life of my son; i wish to present you with a reward," he said. But Fleming said that he had only done his duty. Spotting a boy in rags, the gentleman asked Fleming if that was his son. Fleming nodded. And the gentleman took the responsibility for the boy's education.
Years later the farmer's son became a scientist, Alexander Fleming. He became renowned for his invention of Penicillin. A few months after the invention, the boy who his father saved got a severe attack of pneumonia. And his life was saved, this time by Fleming Jr's invention.
What goes around does come around. As you sow, so shall you reap, in whatever form. Nature returns everything with interest.