Initially, I was thinking negative energy should be used to strengthen resolve. Then I decided to share how a negative can be a positive. http://www.m.webmd.com/a-to-z-guides/features/negative-ions-create-positive-vibes
Negative ions have been demonstrated to improve mood and seasonal blues. Negative ions are known to be found at the beach, lakes, waterfalls and in nature in general. Negative ion generators can be purchased. The more expensive the unit generally more effective it will be.
Air conditioning and computers deplete negative ions in the atmosphere because they release more positive ions. If you work in a building, it is recommended to get outdoors as often as feasible to recharge your energy.
Peace and blessings,
Shems Heru Merri Aton aka Kevin