Final answer:
The statement that you feel tired not because you've done too much but because you've done too little of what sparks a light in you is subjectively true for some individuals. It suggests that emotional and psychological engagement in activities provides energy and motivation, while the absence of such engagement can lead to feelings of fatigue.
Step-by-step explanation:
The statement 'You often feel tired, not because you've done too much, but because you've done too little of what sparks a light in you' reflects a view that the source of our energy and motivation is often connected to our emotional and psychological fulfillment. This could be seen as a true statement for some people. Feeling perpetually tired can sometimes be a symptom of a lack of engagement or fulfillment in our daily activities rather than mere physical exertion.
It is related to the concept that exhaustion can stem from both physical and mental states. For example, when Terry gained weight and felt more tired than usual, his doctor proposed a potential medical cause related to a deficiency in thyroid-stimulating hormone (TSH), which could explain physical fatigue. However, feelings of exhaustion can also be linked to other causes such as the emotional strain of feeling out of control, neglecting obligations, difficulty concentrating, or the pressures of bearing burdens such as those experienced by women during wartime. The underlying principle is that fatigue can be the result of many factors, not just physical activity or lack thereof.
On the other hand, the efficiency of machinery, such as a bicycle ridden up a hill, wherein potential energy is easily increased at the expense of kinetic energy, illustrates physical laws affecting energy use and exhaustion. Similarly, other factors like solar wind particles propelling a solar craft or the photoelectric effect do not directly relate to human fatigue but are examples of energy principles in the physical world.