When you go outdoors on a cold and snowy day, you prepare yourself by wearing a warm coat, winter boots, hat and scarf.  

Why not prepare your energy field before you go into a meditation or out into the world?  Everything is energy.  When you go out into the world there is  an ocean of energy that you interact with.   If you have a strong energy field or auric field then you are more balance and resilient to what is going on energetically around you,