What have you done with what you learned?

Abu Darda: 

I am not afraid that it will be said to me: "Oh Aamir what have you learned?", but I am more concerned that it will be said to me: "Oh Aamir, what have you done with what you have learned!"

Author: al-Khatib al-Baghdadi

Source: Fadl Ilm us-Salaf