Happiness cannot come from without. It must come from within. It is not what we see and touch or that which others do for us, which makes us happy; it is that which we think and feel and do, first for the other fellow and then for ourselves.   - Helen Keller

If you would own all the money in the world, would you be happy?

The answer would be surely “No”. 

“Money” and “Happiness” need not be interlinked. Then does that mean that without “Money” one can be very happy?

Money Isn't Everything
It can buy a bed - but not sleep
It can buy a clock - but not time
It can buy you a book - but not knowledge
It can buy you a position - but not respect
It can buy you medicine - but not health
It can buy you blood but - not life
It can buy you sex - but no love
So you see, money isn't everything, and often causes pain and suffering.
I tell you all this because I want to take away your pain and suffering.

So please send me all your money and I will suffer for you. That was meant to be a good joke.

We have to surely understand to learn to separate “Money” and “Happiness”. 

Get into the belief that “I can be happy with Money or without Money. But I would prefer to be happy with Money”

For ages there has been a tremendous conflict with Money and Happiness. But who ever said they both couldn’t stay together. There are “Gods” for everything in India, but I am not too sure if there is a “God of Happiness”.

Maybe thousands of years back there was no conflict and people learnt to be happy always no matter. Then how can we increase our happiness? We need to define happiness:

Webster offers the following clarifying distinctions:

 "Happy generally suggests a feeling of great pleasure, contentment, etc.

 Glad implies more strongly an exultant feeling of joy.

Cheerful implies a steady display of bright spirits, optimism, etc.

Joyful and joyous imply great elation and rejoicing." 

Finally, Webster defines Bliss as "great joy or happiness."

Any one of you would know by looking within your internal state “Are you happy”.  Many of us lie so much to our self. You just need to be true to yourself and happiness is deep within.

You can observe out in villages and smaller towns many people are so happy with even less Money.

Sit for some time in a lobby of a 5 star hotel where you would find the richest of the rich, many of them sadly so lost with no trace of happiness. What does happiness depend on, then?

It depends 100 % on your-self.  It depends on your attitude to events and life itself. Simply it is an “Attitude”. It can be your “True Nature” or “Natural Self”.