WHAT IS MEDITATION?
Meditation is a 'special unique' art of using our mind power/energy to 'solve' our spiritual, physical problems and ailments through contemplative focussing. When we meditate each time, our soul goes 'spiritual travelling' to the Divine Worlds for spiritual learning and repaying 'karmic debts'. This leaves our body like a vacuum, thus exposing it to any 'negative possession' of it. As a result, it is dangerous to do meditation without proper guidance under a spiritual teacher.
The purpose of this spiritual travelling and learning through meditation is to pay back our past 'karmic debts' soonest possible. It is understood that not all of our past 'karmic debts' can be repaid in a lifetime in our physical form. Therefore, it might take many reincarnations before one could repay all one's 'karmic debts' ie. become a 'fully purified soul' to be 'one with God'.
For this main reason, whenever we do meditation, we are said to have 'died' once and for many meditations, we have 'died' many times. During our meditation, our soul is said to be 'seeking and repaying' our past 'karmic debts' through our soul form. Therefore, it is not necessary for one to go through reincarnation after reincarnation for a soul being to repay all one's 'karmic debts'. It is difficult but not impossible for one to repay one's 'karmic debts' in a lifetime through spiritual meditation.
How fast and how much one's soul has repaid its 'karmic debts' depends very much on the individual self.