Enough

If you know Christ and him crucified, you know enough to make you happy, supposing you know nothing else. And without this, all your other knowledge cannot keep you from being everlastingly miserable. 

--George Whitefield, in a sermon on 1 Cor. 2:2 in 1739, in The Sermons of George Whitefield (ed. Lee Gatiss; Crossway, 2012), 2:238