1 Corinthians 1:25

Because the foolishness of God is wiser than men; and the weakness of God is stronger than men (KJV)

Then: Paul still lingers on God himself, not quite explaining how the Corinthians need to know what he is teaching. First they must have rock solid information about God's wisdom and knowledge. Even his foolishness (if there there could possibly be any) is wiser than the accumulated wisdom of men. His weaknesses (if ever there were any) are stronger than the greatest strength of one man or all men put together. God is worthy.

Now: Discerning the character and personality of a God you don't see except through the process of human affairs, a God you don't hear except in moments of prayer, and a God you can't touch except through the ministry of fellow humans is just plain hard. On the other hand, vacillating between faith and doubt, trust and worry, courage and fear is so easy that a church which could draw upon the Lord's strength, does not. Instead it looks to itself, wobbles and falls. Today's churches must first look to God, his character and strength, then figure out how to grow in Christ. That's where Paul is headed. That's the purpose of his letter.