Is science the only discipline that gives us knowledge? Of course not. For knowledge, the humanities are needed. In fact, without the humanities there is no knowledge.
Consider the statement: Only the sciences give us knowledge. This statement is not something science can conclude. It is a philosophical statement, something like a worldview claim. With statements like this we enter the realm of the humanities.Science provides the "how"; the humanities provide the "why."
The American Academy of Arts and Sciences has just published a 61-page report entitled "The Heart of the Matter." Richard Brodhead, the president of Duke University and a co-chairman of the commission that produced the report, states: People talk about the humanities and social sciences “as if they are a waste of time. But this facile negativism forgets that many of the country’s most successful and creative people had exactly this kind of education.” ("Humanities Committee Sounds an Alarm," nytimes.com, 6/18/13)
Here's a video by the AAAS.
