Every wise workman takes his tools away from the work from time to time that they may be ground and sharpened; so does the only-wise Jehovah take his ministers oftentimes away into darkness and loneliness and trouble, that he may sharpen and prepare them for harder work in his service.

Memoir and Remains of the Rev. Robert Murray M'Cheyne: Minister of St. Peter's Church, Dundee (ed. 1846)