Life depends upon choices. At every instant life is giving us options from which we have to choose.
So it becomes very important to learn what kind of choices would result in gain and which ones would result in loss.
Well, it all depends on energy.
While making a choice all you have to do is to look at your energy. If one choice reduces your energy then there is no need to make that choice in spite of all the reasons in its favor.
On the other hand, if a choice increases your energy then that is a right choice, even though there are sufficient reasons against it.