Energy is most important for a human because whatever we perform it requires energy. A day well spend without loss of energy is very perfect day. We should always keep positive images in our mind, those images continuously passes the positive energy to our body and we can do all our work with full force without drain of energy. Many times we feel low, The moment it happens, Think about most positive things that you have attained and you are going to attained. Our mind will pass the strong energetic wave of emotions to our body. Those emotions will force us to perform with full energy, those emotions will lead us forgetting our tiredness and pain. That energy will make our body stronger to fight and our body again will start feeling energetic.
Positive mind is best source of energy.