The mathematician does not study pure mathematics because it is useful; he studies it because he delights in it and he delights in it because it is beautiful.
數(shù)學(xué)家研究純數(shù)學(xué)不是因為它有用；他研究它是因為他喜歡它，他喜歡它是因為它美麗。
心理學(xué)的任務(wù)是研究經(jīng)驗的直接內(nèi)容。