Good News Translation
To an ignorant person, wisdom is as useless as a house gone to ruin. He has never even thought about the things he is so sure of.

New Revised Standard Version
Like a house in ruins is wisdom to a fool, and to the ignorant, knowledge is talk that has no meaning.

Contemporary English Version
Knowledge means nothing to ignorant fools, and wisdom is useless as a burned-down house.

New American Bible
Like a house in ruins is wisdom to a fool; to the stupid, knowledge is incomprehensible chatter.

Douay-Rheims Bible
A man of sense will praise every wise word he shall hear, and will apply it to himself: the luxurious man hath heard it, and it shall displease him, and he will cast it behind his back.

A man of sense will praise every wise word he shall hear, and will apply it to himself: the luxurious man hath heard it, and it shall displease him, and he will cast it behind his back.

Sirach 21:16
The knowledge of a wise man shall abound like a flood, and his counsel continueth like a fountain of life.

Sirach 21:17
The heart of a fool is like a broken vessel, and no wisdom at all shall it hold.

Sirach 21:19
The talking of a fool is like a burden in the way: but in the lips of the wise, grace shall be found.

Sirach 21:20
The mouth of the prudent is sought after in the church, and they will think upon his words in their hearts.