If you have an inner problem and want the solution, you concentrate on this problem; if you want to know the condition you are in, which you are not aware of—if you want to get some light on the state you are in, you just come forward with simplicity and ask for the light. Or else, quite simply, if you are curious to know what the invisible knowledge has to tell you, you remain silent and still for a moment and then open the book. I always used to recommend taking a paper-knife, because it is thinner; while you are concentrated you insert it in the book and with the tip indicate something. Then, if you know how to concentrate, that is to say, if you really do it with an aspiration to have an answer, it always comes.
Ref: Questions and Answers 1956