Proclaiming Christ, Not Ourselves
This great quote from James Denny (an old Scottish minister) is a particularly good word for pastors, but it applies to all of us to some degree:
"No man can bear witness to Christ and to himself at the same time. No man can give the impression that he himself is clever and that Christ is mighty to save." (Quoted in John Stott, Between Two Worlds, 325)
(HT: John Piper)