How can learning a foreign language influence the learner's behaviors and thoughts?

In a sense it might change things. In Asian culture, there is a different way of addressing people for example. Which comes from a value of respecting elders and knowledge. An elder person will receive great treatment, a student a year higher will be regarded with respect, just because of being elder.. A person coming from an environment, Western for example, will come to face decisions on how to address what person. Which in term can influence the behavior naturally.