Live for that feeling

I am talking about the feeling , you get after completing a task or after you come home from work.
Now that feeling would only come after some work that put burden on your mind.

And that feeling is awesome. 

Now to have that feeling , you must go through the difficult period.

The more difficult a period is , the more intense and pleasureable the feeling is.

 That is what you have to remind yourself that you live for that feeling but which comes only after the work.

 So , no matter how difficult the task/job is , live for that feeling and keep on telling yourself.