Once a boat owner decided to get his boat paint. So one day, he called a painter and asked him to paint his boat. Painter bought with him paint and brushes and began to paint boat with bright red color as owner asked him. While painting boat, he realized that there was a hole in the hull and decided to repair it. After he finished painting, painter received his money from owner and left. Next day, owner of boat came to painter and presented him with a check with amount written much higher than payment of painting. Painter was surprised and said, "You have already paid me for painting the boat."Owner replied, "Yes. but this is not for paint job. it's for having repaired hole in boat."Painter replied, "Ah! but it was such a small service. certainly it's not worth paying me such high amount for something so insignificant."Owner said, "My dear friend, you do not understand. let me tell you what happened.when I asked you to paint the boat, I forgot to mention about hole to you. when paint on boat dried, my kids took boat and went for fishing trip.they didn't know that there was hole in hull of boat and I was not at home at that time.when I returned and noticed that they had taken boat, I was desperate because I remembered that there was a hole in boat and I hadn't asked you to repair it.imagine my relief and joy when I saw them returning from fishing, safely.then I went on boat and examined it, I was surprised to find that you had repaired that hole, even when I hadn't ask you to do it.you see, now what you did?you saved life of my children. I don't have enough money to pay for your small good deed." 
No matter who, when or how.. Just continue to help. No matter how small it is because you never know when one is in need of us or when god holds a pleasant surprise for us to be helpful and important to someone. 