Hadith 292
العلم علمان؛ فعلم فى القلب فذاك العلم النافع و علم اللسان فتلك حجة الله على ابن آدم
"There are two types of knowledge: one is the knowledge that is in the heart, and that is beneficial knowledge; and the other is the knowledge of the tongue, and that is Allah's proof against the son of Adam."
