Jessica’s advisor recommends that jessica take courses in at least one foreign language because, he says, there are some thoughts that simply cannot occur to people who speak only one language. her advisor’s opinion is probably based on

The answer is the principle of linguistic relativity or the linguistic relativity hypothesis. This holds that the structure of a language resolves or greatly persuades the modes of thought and behavior characteristic of the culture in which it is spoken. This is also called Whorfian hypothesis. The principle is frequently defined to contain two versions. The first version or weak version says that linguistic categories and usage only influence thought and decisions, while the second version or the the strong version states that language decides on thought and those linguistic categories bound and determine cognitive categories.

depends on what they need

using the scientific method.