A most important aspect of spirituality is protection. There are simple measures that you can take to defend yourself from negative energies and dark entities that can reduce your well-being to the point of harm. Every good spiritual medium (one who communicates with those passed-over) is taught how to protect themselves, but it's not just them who need it. Medium's open themselves up to spirit contact regularly, however you're likely to encounter negative energies in the form of an emotional vampire human acquaintance, energies of an object or place, or even a dark entity or spirit that has wandered into your space. You need not fear or let them drain your emotions to a low vibration - because you can take complete control.
Protection is Needed Due to:
Psychic attack - a human that harbors negative emotions toward you projects low vibratory energies that you absorb. It can come from someone close to you or someone at a distance, because distance often no bearing if the attacker can visualize (simply think of) you as an individual. The negative emotions serve to counteract your positive vibration, literally canceling out your happiness.