Warning from History Re. Novelties

Just incase you're questioning the value of studying Systematic Theology (or Church History for that matter)...
But it is truly laughable to hear doctrines established and taught by the
greatest divines for so many centuries, now condemned as execrable, by those,
who never studied divinity in their lives, nor never [sic.] read any system of
theology whatever.
(Devereux Jarratt, cited in Iain Murray, Revival and Revivalism [Carlisle: Banner of Truth, 1994], 84)