Knowledge manifested through action versus mere words
Nahj al-Balāgha|Volume 1|Book 3|Chapter 92
٩٢. وَقَالَ (عليه السلام): أَوْضَعُ الْعِلْمِ مَا وُقِفَ عَلَى اللِّسَانِ وَأَرْفَعُهُ مَا ظَهَرَ فِي الْجَوَارِحِ وَالْأَرْكَانِ.
92. Amīr al-mu’minīn, peace be upon him, said: The lowest form of knowledge is that which remains on the tongue and the most superior form is that which manifests itself through (the action of) the limbs and the organs of the body.