Your gratitude is valuable for anyone. Is not grateful to everybody. Is to those Thankfully you really love and to you do something good and nicely to you are. If you waste your gratitude, your heart does not believe you any more you it so means.
Two buddhist monks are walking down a road. They see a woman trying to cross a stream. The first monk picks her up and carries her across. She says "thanks" and they go their seperate ways. But the second monk is spitting mad. After a few miles, the second one speaks up, tells the first one: "You violated the rules of our order when you carried that woman across the stream." And the first monk replies: "I may have carried her across the stream - but you've been carrying her ever since."