Observations - Desire and Happiness

I had a question on my mind about why happiness based on desire is short-lived and momentarily?

Yesterday, when I was meditating deep, the question got lost in it. But when I came back from the deep, an answer dawned upon me. Here it goes:-

What is Desire? 

The answer said: It is the want which is based on any unit that is measurable. Meaning, anything which has a defined beginning and a defined end that measure is our want.

The desire is always between that beginning and that end. It always delves upon this measurement.

Then why the happiness is short lived when we achieve the Desire?  

The answer said: Because, just like we base our desires on measurable units, the same way we base our happiness on our desires. I will be happy when my desire to get promoted is fulfilled. I will be really happy, when my desire to loose 5 kilo is achieved. But no, when the desire is achieved, there is another desire already building up. Or, the happiness is short lived as it also defined, measured.

So, what is the way to eternal happiness?

The answer said: Just as learning is eternal and is an ongoing process, so is happiness. Human being never tends to base their learning on something measurable. Mostly everyone understands that learning happen everyday with each and every step of life. The same goes with happiness. You can be happy anyway. It is ongoing and need not to be based upon goals, desires or greed.

Be happy right now, inside yourself and you will no longer be a slave of desire.