New Revised Standard Version
The dullard cannot know, the stupid cannot understand this:

Contemporary English Version
for an ignorant fool to know or understand.

New American Bible
A senseless person cannot know this; a fool cannot comprehend.

Douay-Rheims Bible
The senseless man shall not know: nor will the fool understand these things.

The senseless man shall not know: nor will the fool understand these things.

a brutish

Psalm 32:9 Do not become like the horse and the mule, who have no understanding. With bit and bridle bind fast their jaws, who come not near unto thee.

Psalm 73:22 And I am brought to nothing, and I knew not.

Psalm 94:8 Understand, ye senseless among the people: and, you fools, be wise at last.

Proverbs 30:2 I am the most foolish of men, and the wisdom of men is not with me.

Isaiah 1:3 The ox knoweth his owner, and the ass his master's crib: but Israel hath not known me, and my people hath not understood.

Jeremiah 10:14 Every man is become a fool for knowledge, every artist is confounded in his graven idol: for what he hath cast is false, and there is no spirit in them.

1 Corinthians 2:14 But the sensual man perceiveth not these things that are of the Spirit of God. For it is foolishness to him: and he cannot understand, because it is spiritually examined.

a fool

Psalm 14:1 Unto the end, a psalm for David. The fool hath said in his heart: There is no God. They are corrupt, and are become abominable in their ways: there is none that doth good, no not one.

Psalm 49:10 He shall not see destruction, when he shall see the wise dying: the senseless and the fool shall perish together: And they shall leave their riches to strangers:

Psalm 75:4 I said to the wicked: Do not act wickedly: and to the sinners: Lift not up the horn.

Proverbs 1:22 Turn ye at my reproof: behold I will utter my spirit to you, and will shew you my words.

Proverbs 24:7 Wisdom is too high for a fool; in the gate he shall not open his mouth.

Luke 12:20 But God said to him: Thou fool, this night do they require thy soul of thee. And whose shall those things be which thou hast provided?