Saalih Bin Mihraan Ash-Shaybaani (rahimahullaah) said:

”Every workman is not be able to carry out his work except with tools; and the tools of Islam is knowledge.”

[Source: Quoted by Shaikh Abdullaah Al-Bukhaari in Maqaalaat Ash-Shar-iyyah page: 23; and its original source is found in Tabaqaat Al-Muhadditheen Bi-Asbahaan 2/216 ]