Imagine your good feelings as rainwater, and your body as the catchment area for the rainwater.
As you make sure you feel as many good
feelings as possible, you are keeping the catchment area full and overflowing. But if you forget to deliberately put the good feeling in, the water level will drop very low to the bottom where the silt and lie.. Negative feelings are just an indication to you that your catchment area has dropped down to the silt and mud, and that you need to fill yourself up again with good feelings until you are overflowing. Keep yourself overflowing by deliberately filling yourself with good feeling every day.
The Secret