It took me a while to realize this, but really positive intent is everything in life.
One thing I have learnt in Tai Chi is seeing intent in action. Literally I see the manifestation in push hands and applications.
Simply by where you put your mind can have a drastic effect on how well you push. Is your intention on where your hands connect to your opponent or is it through the person in a distance! Is it purely trying to satisfy the desire to win, or is it a desire to learn the right skills. The difference in how much strength you have to put in a push if you do it right is remarkable!
Intent powers our chi, our energy and our lives.
Often you find in life when you are tired mentally you cannot do anything physically. I think depression could be a symptom of this too. Have you also noticed what a difference it makes when you make a conscious decision to do something or stick with something? It almost seems like this is driving you forward! The difference is the power of the intent.
Now intent has a quality and a range too, it can be shallow, scattered, short term, selfish...or it can be deep, focused, long term, selfless...The later always brings joy to others and ultimately to yourself in the long run, while the former brings you some short term benefits, but longer term it leaves you dry and empty.
You want to keep more of the positive intent in life as much as possible!