So why do we use the hands for healing?

There's a good reason: the palms of the hands have powerful psychic centres in the middle - in fact if you were to look at them clairvoyantly you could see a lot of psychic activity within them, as they are continually radating energy. These centres are rather like a spiritual ”guns“, which the person who knows can use to send powerful streams of energy into the patient.

The right hand (normally) is a positive, while the left hand is negative. This means that it can behave like an electrical circuit, sending energy from one to the other. And the fingers too contain very strong psychic centres  at the tips. Taken as whole they are powerful floodgates of energy for great healing forces to flow.