When we smell essential oils, we register the scent in the limbic system-the part of our brains where memories are stored, emotions are processed, and moods are stimulated. That's why we all have such personal connections to certain scents: when we come in contact with an aroma, our subconscious receives and reacts to it before we are even aware of it. The fragrances of some essential oils automatically encourage us to relax. Others make us feel more energized. Still others leave us calm and comforted. Best of all, essential oils have antiseptic, antiviral and antibacterial qualities that make them as good for our bodies as they are for our spirits.