Picture your astral body as a balloon

Picture your astral body as a balloon. Your kindness, acts of charity, compassion, prayers, meditations, good intentions, and so on, produce astral energy that fills the balloon. When it is full enough, you will rise out of the confines of your physical body. When it is even fuller, you will escape the pull of Mother Earth's gravity and be able to roam the solar system. This goes on until your astral body fills totally, and the balloon bursts. Your pre-preatomic energy is free to join the infinite divine creative consciousness that permeates the universe, and you are free of all limitations, be they physical or astral.