The Bible makes it abundantly clear that foolishness (or stupidity as it is better known today) is a bad thing. It's sinful. This means it's against God's will. We are to turn away from it and not practice it. (The opposite is wisdom, which is highly encouraged.) Paul confirms this in his deeply sarcastic passage, 2 Cor. 11:19.

Believers are not to tolerate foolishness any more than any other sin. How, then, are we to treat the fools themselves, those who practice foolishness or stupidity? Among others, 1 Thess. 5:14 shows us the answer: "Be longsuffering toward all men." The Lord Jesus was certainly longsuffering in His earthly ministry, and our Father is enormously patient with us even now.

This is a difficult lesson for me. I abhor stupidity (most especially my own), particularly the well practiced kind. It disgusts me like almost no other injustice or sin. I find in my heart I can more easily forgive a serial murderer than I can the habitually stupid. I can understand the pathology behind murder. Even though I can intellectually grasp the motivation* for stupidity, I still struggle to abide those who favor its exhibition. I may suffer fools with my teeth clenched for now, but even that will be turned to love by the Lord as I yield to Him.

Suffering fools but not their foolishness is another example of loving the sinner while hating the sin. Easy to say; difficult to practice.

*_{Motivation for stupidity
When you read the traits of sapience, consider those earning low scores. Wisdom requires a great deal of effort, discipline, and sacrifice. As with most sins, stupidity is easier and self-gratifying.}