For those who are acquainted with video games, the primary way to lose in a video game is usually for your character to die, and that death is caused by their health bar being reduced to zero. However, that "bar" isn't always applied to a character's "health", but also to things such as sanity, fuel (if you play as a vehicle), some kind of power of might (like the might of a military force you send to battle) and so on.
The concept of a "Health Bar" could be applied to real life as well, and since we are distinct beings, each of us have a different capacity, AKA a "Bar" of that could indicate our state of being in life. In addition, some "Bars" are more crucial to some people than others, sometimes because they are higher or lower than what is considered an "average" capacity of a "Bar". For example, some people are more ill than others, physically, so they need to be more careful of their health, as that could be more critical. Another example are those who suffer from diabetes, and have to keep their in-body sugar from being overdosing. Yet another example, far more common, is in romance -- with each "Bar" of romance being "filled", you become more in love with your partner more. Yes, that also exist in some video games as a feature (mainly dating simulators).
Obviously, these "Health Bars" aren't as real as a physical object such as a table or cup, but they surely can be used as a metaphor for the fact that we are not infinite beings. We are, in fact, a product of countless, limited "Bars" that are needed to be either maxed, balanced or reduced. Of course, once again, some of us are blessed with more-optimized "Bars" such as the greatly healthy and the wealthy, while others are "cursed" with the exact opposite (by having many ills and lack of money, for instance. Finally, another thing is to be put in mind -- some of these "Bars" can be changeable (one can increase their health through physical exercise), while others have these "Bars" fixed and thus, unchangeable (like with symptoms which cannot be cured, a disability and so on).
The wisdom of this theory is this -- if one wishes to live with satisfaction, one must increase the "Bars" that are best increased, balance those who are best balanced, reduced those who should be reduced, and do all of those ONLY on the aspects of life that can be influenced. Ignore the 'Bars" that cannot be helped with, and you will be realistic; Ignore the "Bars" that can be altered in their respective fields, and you will be a pessimist. If this theory teaches us something, is that everything is limited, and thus, we should treat them with care, so they will not go to waste; a waste whose at least some of it is avoidable.
Truth be told, there are certain "Bars" that are more dominant in certain people's life, and some of these are arguably not present at all in other's lives. As at least some of you may know I have a "Bar" of my own in the form of mental exhaustion. Unfortunately, I cannot work too hard or I risk becoming exhausted -- and thus paralyzed. I hate to admit it, but I'm a quite fragile person, and even extensive stress could lead to say paralyze. How can one better describe it? It's like an "Energy Bar" in certain games -- perform activities too much and your energy will deplete, and when it reaches zero you are required to leave the game for a while until you have a decent-enough amount of energy to resume playing. When this "Bar" of mine reaches zero, I risk becoming confined to the place I'm currently at for some time; the longest period of paralysis lasted... 7 hours. And it's horrible, too.
In order to live in a wisely matter, one must know not only himself, but also what they are capable of and what they're not. After all, if you will not aquire this knowledge, it will be difficult for you to defend yourself from the misunderstanding of others. Some countries provide welfare for the disabled, but for citizens in countries that don't, an employer should be aware enough to the employee for their weak points, so the latter won't break down under the burden of their work. Some are "blessed" with the capacity to endure employment because their "Bars" are higher than those of others, while others suffer from the exact opposite, all because they things that lead to a lower "Bar" in that respective regard.
Finally, it can be argued that a human's greatest "Bar" is the bar of the lifespan, which is the product of many components that either increase or decrease it. If one wishes to get the most out of life, one must live as long as possible, so there will be more moments of potential, of opportunity. In order to get that, however, there is a need for the optimization of "Sub-Bars", AKA, bars that contribute together to the end result that is one's entire lifespan.