Pag: 1 (First Barrier)
The first barrier to study is not having the real thing there that you are studying about.. The real things or the object that you study are called mass.
If you were studying about cars, you could get the mass of a car by going to a real car and looking at it and touching it.
Pag: 2 (First Barrier)
Studying about something without having the mass of what you are studying can give you trouble. It can make you feel different ways.
It can make you feel squashed.
It can make you feel bent,
Pag: 8 (First Barrier)
Sometimes you cannot get the real object you are studying about.
When this happens pictures help. Movies would help too.
But reading books or listening to someone talk does not give you mass.
They do not take the place of what you are studying about.