It can accept certain things, and beyond that it cannot go. It does not mean that the mind will be thinking only like that forever. You cannot expect everybody in the world to think alike. They are born at different times and so they will also think differently, but everybody will think everything at the proper time. It is a question of time and evolutionary process.
Evolution is an ascent.
It is not possible for everyone to be in the same psychological level. Otherwise, everybody would be the same all people in the world would be thinking the same thought. That is not possible because of differing stages of psychological evolution. Vegetables do not think of God, and you cannot find fault with them merely because trees are not meditating on God Almighty. They are also existing in one level, and it is perfectly all right.