In actual fact we can only know our own culture by comparison. We can only enter into another culture to the extent that we are able to break away from the ethnocentrism that binds us to our first cultures. And this ethnocentrism is challenged not by the illogical aspects of our own culture but by the negative feedback provided by the clash with another system of meanings, another culture. Therefore, the leaving and acquiring must be done together bit by bit. This is because cultures are not based on systems of interpretation and knowledge but rather the opposite.
Philosophies stem from culture.
Our understandings of ourselves are a product of our total culture. Ultimately the meaning and relevance, the value and veracity of a culture reside in the common experience of the world by the people sharing its common cultural lense. This experience makes sense out of what appears to be illogical. But becoming an insider within a another culture is not simply the taking on of a new perspective, it also involves leaving the tyranny of our first culture and world view. Thus those who would wish to enter must also learn to leave.