In my opinion for every single person the answer could be different
What is the most powerful element in all of existence?
I will give my opinion about ;

Eat as many junk foods as you desire with no implications;

Everyone has its own views about money. Anyone think money is everything in this world, how does. Logically we can't fullfill the needs without any money, we can't buy what we need and want. we are not respected and are seen by the public, in other words that the money is a source of happiness for people who think of it all. Therefore there are people willing to do anything for money. They should make time to pawn the family, mortgaged the obligation as a slave, her health, even to pawn the honor and the principle of life. For the sake of a piece of paper, which is mostly sought not to make ends meet, but the vent all the mundane desire. That's why there's a saying *** easy come easy go ***, illegitimate money are searchable by all means, befriends aground somewhere where. At the gaming tables, in discos, at the mall, in a place of prostitution. That's how. Like drugs or smoking, it will become a habit without the slightest enjoyment. Because people who think only of the material, his heart will not be quiet.

There will be life after death, the trust may like this decide the snare-snare of materialism in the lives of believers. They understand that they live by taking responsibility as a servant, spent the day with worship and membaguskan themselves into a personal best when meeting with their Lord. And not Just that, they are aware that their behaviour with all the wealth that he get and spend will be questioned one by one. Starting from halal haram, then how she spends. That's what makes the one its own idealism for a believer. The excess treasure that will enslave the owner, plunges to the vain things let alone a sin.

Yes, they are aware of the location of the happiness and peace of mind that in fact it's not on their ability to get what they want.
Thank for this My Teacher @nomad-magus