If one looks at the laws of physics one will see that there are no such things as cold or darkness.  These are merely terms we use to describe the absense of heat or light. 

You can not transmit cold.  The feeling one gets when touching an ice cube is the feeling of heat being tranferred out of the body by conduction.  When one stands outside on a winter's day the cold we feel is the heat leaving our body through radiation and convection to the air around us.  By international agreement, absolute zero is defined as 0 °K on the Kelvin scale and as -273.15 °C on the Celsius scale. This equates to -459.67 °F on the Fahrenheit scale. This is a point where all thermal energy is non-existant.

In the same manner, darkness is merely the absence of light.  Darkness does not have any physical properties whatsoever.  It cannot be measured except in it's relationship to light.  Light has definate physical propoerties.  It can be shined, reflected, bent, etc.  Try this with a beam of darkness.

In my opinion good and evil work the exact same way.  Evil is merely the absence of good.  Evil has no power.  It is a non-entity except when measured in it relationship to good.  Hence it is also my belief that there is no Devil.  The Devil is something that man invented to describe the absence of God.  The term "the Devil made me do it" really means "I was being self centered and ignoring God's will when I did it".

Terry