I Corinthians 1:18

For the preaching of the cross is to them that perish foolishness; but unto us which are saved it is the power of God (KJV)

Then: Plain and simple. Paul wants the Corinthians to abandon all the artifices of language and concentrate on the cross: Jesus crucified so that they might be forgiven, made clean, and be acceptable at the foot of heaven. Foolishness to non-believers, it is God's powerful plan to those who experience his love and presence. Matthew Henry adds that believers must repent and submit to the Lord's authority in their lives. Baker (p. 37) calls the verse a thesis statement with set markers dividing the destroyed and the saved. That's one division which Paul accepts. His calling is to convince men to understand and discern the plain Truth.

Now: Paul's words and message continue to speak to all who have ears to hear. The cross is more than a symbol. Its a clear reminder to those who know Christ. The Truth must not be tangled or hidden in contrived orations. Today many follow Paul's lead and spend their lives teaching the Word -- some have formal training, some don't. But all know the Truth and want everyone to hear the message of the cross.

Extra source: Commentary on the Whole Bible Acts to Revelation Vol VI by Matthew Henry online at http://www.ccel.org/ccel/henry/mhc6.iCor.ii.html
Cornerstone Biblical Commentary 1 Corinthians (William Baker), 2 Corinthians (Ralph Martin & Carl Toney), ed. by Philip Comfort. Carol Stream: Tyndale House Publishers, c2006.