Paul reminds them and us: Chasing after what the world thinks is important is different from seeking what God thinks is important.
God has shown us an amazing contradiction--a crucified savior. Any sensible, analytical person would see that as an oxymoron. Yet, this is the message we are preaching, a message that rather than confirm would seems wise and sensible, is a message that replaces our notions of what is wise and sensible.
God does not work according to our expectations or logic.
Further, what miracles and philosophy can fail to do, God can achieve.
Note: I am helped by Boring and Craddock's The People's New Testament Commentary.
Lectio Divina: 1 Corinthians 1:18-20