Everyone is born with limited lifeforce or energy or prana called Qi. This gets depleted every day.
We get energy from various sources.
1. Earth Energy: We get energy from the food we eat, the water we drink, from the calm pleasant natural surrounding etc.
2. Man Energy: From the interaction with people, from the company we keep. Happy people make us happy. If we are in the company of drunkards, we may become drunkard. If we are in the positive challenging environment, we grow.
3. Heaven Energy: Energy from Sunlight, Air etc.