In the subjective world, speech is not used; communication is through thoughtwaves. Those who have not passed away but can function in the subjective world can formulate thoughtwaves into words. But those who have left their physical brain have only their mental body, and if the mental body is not developed and cultivated by the science of spiritual thinking, then the person has a real problem in the subtle world. He cannot understand what is going on there. He cannot communicate with people. The guides, or invisible helpers, cannot teach or lead him. It takes hundreds and thousands of years to communicate with him through some sparks of thinking still left from the physical existence.
Conscious progress in the subjective world depends highly on our ability to think, to send and receive thoughts, and to understand them in their abstract values. This is what the science of meditation teaches.
Spring of Prosperity