That there is knowledge that is not popular means hidden knowledge. This science is the science of compounding all beings. Knowledge that is not popular, because indeed, many people do not agree with it, so the bearer of this knowledge is often called an isolated. Why is that, because this secret knowledge eliminates all barriers, the turbidity of fanaticism.
Therefore, religious leaders or whoever it is, always carry popular teachings, such as love, readings, humanity, etc., this is because these teachings are popular, so it is easy to reap the masses to the present.
In contrast to the Oneness of God, and everything that is very secretive to the general public. So don't be the people who reject differences, because of the narrow space of knowledge and spirituality, then casually, unworthy words are thrown to fellow humans.