When should you give up?

You keep working on your target but you don't succeed. You keep trying but keep failing. So should you continue or should you give up. And if you should give up, when should you?

the following poem by Garth Brooks gives you an answer!

You know a dream is like a river, ever changing as it flows.
And a dreamer's just a vessel that must follow where it goes.
Trying to learn from what's behind you and never knowing what's in store
makes each day a constant battle just to stay between the shores.
And I will sail my vessel 'til the river runs dry.
Like a bird upon the wind, these waters are my sky.
I'll never reach my destination if I never try,
So I will sail my vessel 'til the river runs dry.
Too many times we stand aside and let the water slip away.
To what we put off 'til tomorrow has now become today.
So don't you sit upon the shore and say you're satisfied.
Choose to chance the rapids and dare to dance the tides.
                                                                - Garth Brooks

Do you believe that the river of your life has dried up? Till you are convinced that the river has dried up and there is no water, you should keep sailing. A good tide may come your way amytime and take you to your destination. You just have to keep navigating