1 Corinthians 1:25

For this foolishness of God is wiser than men; and this weakness of God is stronger than men.

1 Corinthians 1:18

For the discourse, [the subject of which is] the cross, is indeed to those who perish, folly; but to us who are saved it is the power of God.

Romans 11:33-36

O the depth of the riches both of the wisdom and knowledge of God! how unsearchable are his judgments, and how incomprehensible his ways!

1 Corinthians 1:27-29

but the foolish things of this world hath God elected, that he might confound the wise; and the feeble things of the world hath God elected, that he might confound the mighty;

2 Corinthians 13:4

For though he was crucified in weakness, yet he liveth by the power of God: for we also are weak in him, but we shall live with him by the power of God [displayed] towards you.

Treasury of Scripture Knowledge

Summary

Because the foolishness of God is wiser than men; and the weakness of God is stronger than men.

Bible References

The foolishness

1 Corinthians 1:18
For the discourse, [the subject of which is] the cross, is indeed to those who perish, folly; but to us who are saved it is the power of God.
Romans 11:33
O the depth of the riches both of the wisdom and knowledge of God! how unsearchable are his judgments, and how incomprehensible his ways!