How to show your gratitude

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 I read somewhere some time ago {start of a song} that we should use what we have to the best of our ability because if not our prosperity would be wasted.  People who have nothing - no clean water, no housing, no food etc wouldn't be better if we wasted what we have. I didn't really understand what it meant at the time but yesterday I considered my position. 

I complain that I hate housework and I hate cooking. This is really disgraceful when I consider that I do have a house and should be grateful and should keep it clean. I do have food and should be grateful so shy am I too lazy to cook when I know that millions of people go hungry everyday. Their are children dying because they have no food and I can't be bothered to cook. 

              

My friends tell me that there is no 'should' ,nothing is compulsory but I disagree on this one. I had a friend who was disabled and in a wheel chair. She said that no one should ever dance in front of her. Using the theory of above the able bodied should use their bodies to the best of their ability otherwise we would all be disabled and that wouldn't help anyone. I can't do this does that mean he should never dance like this?