Sound wisdom, Heb. essence or substance; either,
1. Solid and true felicity, opposed to the vain enjoyments of this world, which are said to have no substance or being, Proverbs 23:5. Or,
2. True and substantial wisdom, which is satisfactory and everlasting, opposed to worldly wisdom, which is but an empty shadow of wisdom, and perisheth with us. A buckler to them, to protect and save them from that mischief and ruin which shall befall all wicked men.