"Preaching Christ for Christ's sake"

From the Memoir and Remains of Robert Murray M'Cheyne by Andrew Bonar, page 45.

(Excerpt from M'Cheyne's journal) "July 8- Since Tuesday have been laid up with illness. Set by once more for a season to feel my unprofitableness and cure my pride. When shall this self-choosing temper be healed? 'Lord, I will preach, run, visit, wrestle,' said I. 'No, thou shalt lie in thy bed and suffer,' said the Lord. Today missed some fine opportunities of speaking a word for Christ. The Lord saw I would have spoken as much for my own honor as His, and therefore shut my mouth. I see a man cannot be a faithful minister, until he preaches Christ for Christ's sake- until he gives up striving to attract people to himself, and seeks only to attract them to Christ."