Jhanas meditation

Jhanas meditation is a very subtle matter.Doing meditation is like us going out from city life,and enter into remote life,no body is around us,only our self. In such environment,normally one will recall those things around us. Similarly in meditation.Meditation is to cut off both the external and internal factors ,and look into the world of mind. Our mind normally engages with defilements,making it very difficult to keep calm when meditation.If we try seriously to make it continue,it's much difficult.Only we try to be as an observant in relaxation and without any objective,then the mind will settle down slowly. In the world of mind.There are: Kama-loka,Rupa-loka,Arupa-loka,and Pure existence. Those are the memories recorded by our mind.It remembered the various existences of our past in which where we came from. In Kama-loka Jhana,we experience many wandering thoughts-Many Like and dislikes. In Rupa-loka Jhana,we experience Initail,Sustaine,Joy,Ecstatic bliss (happiness) one after the other . When attain ecstatic joy (happiness),one can remain in meditation for few hours or few days. The importance is the happiness fades down (reduce) before the end of Rupa-loka Jhana In Arupa-loka Jhana,the feeling of happiness is lesser then Rupe-loka Jhana. In Arupa-loka Jhana,our mind sees (perceives)the: Infinite space,Endless space,Nothingness,Perception neither exists nor does not exist. Finally,we clearly see the Pure existence immediately after the Arupa-loka Jhana. But due to our human body is composed of Rupa and Nama.Started from our mind (Nama)perceiving Rupa-loka Jhana till the Pure existence.Our mind is further and further from our body(Rupa). When our mind reaches Pure existence,our body(Rupa)no longer can sustain and support the Mind (Nama) further away.Our nature fights for survival and caused the Fear to arise.As it is a danger to one own existence due to our limitation. The importance is we clearly saw the Pure existence-Our mind knows that-This is Pur existence In Jhana meditation,craving strongly supported and maintenance the strengths of concentration.Craving dominates all levels of existences.Except at the end before the Arup-loka Jhana,And the Pure existence. That mean,the lower the existence,the higher the craving.The higher the existence,lower the craving.The total wiped out of craving leading to exist from Samsara,toward Pure existence,and find the way home. Due to the eradication of craving and the mind calm in the attainment of Jhanas.and our memory no refreshment caused by long time in meditation.One'll feel body very weak,and feel like living in different world after attended the Jhanas. All the difficulties can over come by one self slowly later. From this Jhana meditation,we'll realized that our down-fall, from Pur existence to Arupa-loka,again down-fall to Rupa-loka,reach to Kama-loka(human world),are because of our craving, .This Craving blinds us from one existence down-fall to lower existence . Can we imagine,if we're not relying our own effort to eradicate our Craving,but to look for other external agency to save us? In fact,we are the one who manipulate our own fate and our destiny.No one can help us! May the Buddha,Dhamma,Sangha shine for ever May the supreme knowledge of Dhamma ever enlighten the whole world.