When one begins to concentrate, the dropping of a pin will seem like a thunderbolt going through the brain. As the organs get finer, the perceptions get finer. These are the stages through which we have to pass, and all those who persevere will succeed. Give up all argumentation and other distractions. Is there anything in dry intellectual jargon? It only throws the mind off its balance and disturbs it. Things of subtler planes have to be realised. Will talking do that? So give up all vain talk. Read only those books which have been written by persons who have had realisation.