Three custom plastic party cups

There are three custom plastic party cups on the table. 

One cup down to clasp; one cup up, but the bottom of the cup broken hole; the last one inside dirt.

plastic party cups

Three custom plastic party cups can't be filled with clean water.
The first cup, the cup down, can not go in the water;
The second cup, bottom of it has holes, while down side would leak;
The third cup, there is dirt, water would be dirty when poured into, and can not drink.

custom plastic party cups

Like the above three custom plastic party cups, when you refused to accept, you can not learn any knowledge and skills; If you are not seriously when you listen, you might learn something at the time, but not enough to fully understand, let alone application; When you have prejudices about things, you will not get to its original essence.
We can not be any one of the three cup in our life and work.