The only real danger to humans is the one they will inevitably fall into as long as they believe that salvation is to be found in matter

"Even if lengthy studies and great efforts are required, it is easy to work in those domains where we can see, hear, touch, taste, and feel with our physical senses. To see, hear, taste, touch, and feel on the spiritual plane is much more difficult. And it is because human beings experience their inner world as a space where they have no landmark, as a void into which they are afraid to venture, that they cling to objects and achievements of the outer world. But fear is not going to get them anywhere. They must study, learn the laws, and train themselves, and then they can leap into that 'void', confident that they will neither lose their way nor fall. For, in point of fact, the void does not exist. It is the inner world which has not yet been explored that people call the void and gradually, as one explores it, it is within that void that fulfilment is to be found. Yes, the only void that is a real danger to human beings is the one they will inevitably fall into as long as they believe that salvation is to be found in matter."