Robert Murray M'Cheyne, an early nineteenth-century Presbyterian minister who died in his 30s, once wrote:
"True, we ought to know them [the Greek and Roman classics]; but only as chemists handle poisons - to discover their qualities, not to infect their blood with them".
See page 29 of A. A. Bonar. 1966. Memoir and Remains of Robert Murray M'Cheyne. London: Banner of Truth.