Fox and grape

The hungry fox saw a string of crystal clear grapes hanging on the grape vine. The saliva was fluent and wanted to be picked and eaten, but it could not be picked. After watching it for a while, he walked helplessly. As he walked, he comforted himself and said, "This grape is not cooked, it must be sour."

That is to say, some people have little ability to do things, and they use the excuse to say that the time is not ripe.