1 Corinthians 1:25, For the foolishness of God is wiser than men, and the weakness of God stronger than men.
The prerequisite to believing the Gospel is God’s power making us weak and His wisdom making us foolish. For to believe Christ is the Word and Son of God incarnate who was perfect in every way but emptied Himself of all power to die on the cross and was resurrected from the dead three days later, this is foolishness to the world and the world considers us idiots. And to believe in this Christ is to become utterly weak and totally despondent in our sin that we can do nothing but trust in this Christ who emptied Himself of all power on the cross but also performed His most mighty work of defeating death, sin, evil, and the Devil in His death and resurrection.
This Christ-event deeply shames us and weakens us. “God chose what is foolish in the world to shame the wise; God chose what is weak in the world to shame the strong” (v. 27). We think we are wise and all-knowing, but when confronted with the wisdom/foolishness of the Christ-event, we become foolish, for apart from Him we know and fathom nothing spiritually. We think we are mighty, but when confronted with the power/weakness of the Christ-event, we become weak, for apart from Him we are powerless to do anything about our sin and condemnation.
Thus, before the cross we acknowledge our stupidity and sinful woes and cry out in our despondency over our innate iniquity and impotence, for we are too foolish and weak to do anything but receive the righteousness of our Lord that He gives to us by grace through faith as a free gift (Ephesians 2:8-9).