What is the sapir-wharf hypothesis?

From its Wikipedia entry: "In linguistics, the Sapir-Whorf hypothesis (SWH) (also known as the "linguistic relativity hypothesis") postulates a systematic relationship between the grammatical categories of the language a person speaks and how that person both understands the world and behaves in it. Known as the Sapir-Whorf hypothesis, it was an underlying axiom of linguist and anthropologist Edward Sapir and his colleague and student Benjamin Whorf. The hypothesis postulates that a particular language's nature influences the habitual thought of its speakers: that different language patterns yield different patterns of thought. This idea challenges the possibility of perfectly representing the world with language, because it implies that the mechanisms of any language condition the thoughts of its speaker community. The hypothesis emerges in strong and weak formulations."