There are biblical references to fools throughout. Just a few:

Proverbs 29:11 - A fool uttereth all his mind: but a wise [man] keepeth it in till afterwards.

Proverbs 18:2 - A fool hath no delight in understanding, but that his heart may discover itself.

Proverbs 1:7 - The fear of the LORD [is] the beginning of knowledge: [but] fools despise wisdom and instruction.

Proverbs 10:14 - Wise [men] lay up knowledge: but the mouth of the foolish [is] near destruction.

Ecclesiastes 7:9 - Be not hasty in thy spirit to be angry: for anger resteth in the bosom of fools.

Proverbs 14:15 - The simple believeth every word: but the prudent [man] looketh well to his going.

Psalms 14:1-4 - The fool hath said in his heart, [There is] no God. They are corrupt, they have done abominable works, [there is] none that doeth good.

It is irrelevant what you think. What matters is the TRUTH.