Where Do We Get Our Energy From - From Within, Or From Without?

There are different kinds of energy…
Physical energy.
Emotional energy.
Psychological energy.
All are finite, and different people have different levels of energy, for different amounts of time, and at different ages and stages of their life.
Physical energy:
Physical energy has to come from without. From food, from stimulants like caffeine.
Physical energy depletes at different rates for different people, even of the same age and gender.
You can train yourself for higher levels of energy.
If you want to participate in a grueling event like the Boston Marathon, you will have to build up your energy through training.
Without training, your body will tire fast.
Even with a normal routine, that does not involve much physical exercise, the body will get tired in 12–14 hours, and rest is then essential for an energy reset.
Physical energy depletes as you get older.
Emotional energy:
Emotional energy is impacted by physical energy, chemical states, and stressors.
Emotional energy, like physical energy is also finite.
You can be too spent emotionally to react to an emotionally loaded event, if it comes too soon after another emotionally loaded event.
I remember being too spent over Lady Diana’s death to respond to Mother Teresa’s death.
I also remember someone telling me that there were two deaths close to each other in a family; a mother died, and then one of her children committed suicide within 2 days of that; when notified, the surviving family members said “oh”. They were too emotionally spent to react.
Emotional energy is precious, can be drained easily, and can cause your physical and psychological energy to drain, as well.
After a tear-jerking movie, you may find yourself drained of willpower and physical energy.
Psychological energy:
Psychological energy is our great hope.
We can have it in spite of low physical energy, and low emotional energy.
This is why when I was at a low point of my life, I was still able to carry out my business activities successfully. I have written about this in answer to the question…Do you possess the courage and strength to overcome life's hard things?
A recurring inspiration for me with respect to psychological energy is Laura Hillenbrand, and a few others who fought off debilitating illnesses, while they pursued their passion or purpose.
I have written about that too in answer to the question, What is your inspiration, that helps you "never give up"?
The list includes 1) an advertising friend, 2) Dan Ariely 3) Laura Hillenbrand, and recently has grown to include St Julie of Billiart, and the Hole in the Donut, travel-blogging gal.
However Laura Hillenbrand is the dominating figure, and the most recurring inspiration for me for psychological energy.
Psychological energy is best boosted from without - by inspiration, and also by encouragement from other people. If you are a follower of my Quora answers, then you know that I only succeeded in my second career of Commissions Administration because of an encouraging boss. You can learn more about this story from my answer to the question, If you believe you can do something, do you have a better chance of actually doing it?
So if you want my advice, take care of your physical energy needs, and then give yourself regular psychological energy shots by consuming positive support from people who care about you, and where you want to go, and also consuming whatever inspirational content you can lay your hands on. If that means weaning off emotionally, psychologically, or physically draining activities, people, or substances, including Social Media and alcohol, so be it. Do whatever it takes to be psychologically strong - you can't do anything without it!