Knowledge is to know that phrase, a good beginning, but not more. Through conversation, theoretical knowledge becomes practical knowledge being tested out at every turn of the dialogue. The same applies to culture in a general sense. In this process of multiculturation, tolerance is not good enough. The point is to leave the old mind set that some cultures are better than others and enter a new mind set of seeing all cultures as repositories of human experience.
Human beings are similar, so there is something to learn from all repositories.
But the condition is contact, respect, curiosity, knowledge. Above all, be soft, do not push your own idiom too hard, be open to other voices and ways. The goal is not one single culture but softer cultures, for world peace. This may hold for cultures as a whole. But not all aspects of all cultures are worth learning.