Sage is used for energy cleansing or smudging (purification). Sage has been used for hundreds of years along with other herbs in ceremonial cleansing most commonly use by the indigenous american people. They believe any conflict, anger, illness or evil was absorbed by the sage smoke to be released or cleansed from the energy field of a person.
Smudging can be used to drive out stagnant and negative energy. Smudging your sacred space, home, or office is similar to doing a deep metaphysical cleanse. Some scientist even say that smudging significantly reduces the amount of bacteria in the air. It also calms and drives away anxious thoughts. Can be used for meditation and self cleanse.
The perfect time for smudging would be: Move to a living area After being angry or ill Before starting a new job Before and during meditations