Life is complex, its nature is duality, it's complicated, unpredictible and multidimensional. But more than that life is a combination of gross and subtle. The gross though easy to comprehend has its own set of problems and the subtle is very difficult to comprehend.
For example, the body is subtle and the mind is gross. Again the mind is gross in comparison to the soul, or being. While moving from thoughts to words to actions, we are moving from subtle to gross. Actions and words are such that anyone can understand them and control but thoughts are difficult to understand or control. Emotions, feelings, and intuition belong to the subtle world while doing is usually of gross world. Even in emotions, anger, jealousy, greed and worry are gross and easy to acquire while love, honesty, patience, forgiveness and altruism are subtle and difficult to cultivate.
The gross elements in life are useful but without the use of subtle elements, their use is limited and accompanied by much pain and sorrow. For example any medicine doctors use to cure an illness is a gross thing. While medicines do their jobs quickly and efficiently, they also cause a lot of side effects and can even prove fatal. The same effect can be achieved by going deep into the mind using positive thoughts, energies, emotions and feelings to boost one's own immunity and fight the disease. The subtle level treatment is without any side effect but takes time, and not possible for everyone. Only those, who are highly meditative and see inward can harness their subtle energies and bring them in a strong manner, to achieve this. But one can at least combine both, to get better results.
Once we are aware that life has these component,s we can literally feel the days when the body is loaded with negative energies and is feeling unmotivated, lethargic, tired, listless and futile. Such are the periods when you need to sit quietly and meditate, go deep into your inner recesses and find your innermost being or soul, which is powerhouse of energy. If we don't, these frustrations will eventually act on our appetite, sleep and our immunity making us victim of disease- stress, acidity, hypertension, insomnia, diabetes and cancer.
A rose is a gross element. Its fragrance is a subtle element. A flower is incomplete without fragrance. Similarly, the human beings can exist as physical bodies for 70 or 80 years, but they can be fruitful or the life can be meaningful, and they can be existentially successful only if they are able to discover their fragrance. A human being is declared as being alive or dead only on the basis of presence or absence of his shukshma sharira or subtle energy. Apart from this subtle energy running through us, there is no difference between dead or alive.
Our aim should be to acknowledge and get in tune with this subtle force or energy what is known as prana or soul. It is by connecting to this that we get linking of the subtle elements and can harness unlimited potential and energy, to live our lives with joy happiness and peace. Otherwise we will go on living at the gross level finding life only good in phases, often finding life meaningless and frustrated.