Ecclesiastes 10:2

A wise man’s heart directs him toward the right, but the foolish man’s heart directs him toward the left.

The wisdom of the sensible is to understand his way,
But the foolishness of fools is deceit.

Why is there a price in the hand of a fool to buy wisdom,
When he has no sense?

Whatever your hand finds to do, do it with all your might; for there is no activity or planning or knowledge or wisdom in Sheol where you are going.

If the axe is dull and he does not sharpen its edge, then he must exert more strength. Wisdom has the advantage of giving success.

Yet the fool multiplies words. No man knows what will happen, and who can tell him what will come after him?

Then he said, ‘This is what I will do: I will tear down my barns and build larger ones, and there I will store all my grain and my goods.

For which one of you, when he wants to build a tower, does not first sit down and calculate the cost to see if he has enough to complete it?

Treasury of Scripture Knowledge

A wise man's heart is at his right hand; but a fool's heart at his left.

If the axe is dull and he does not sharpen its edge, then he must exert more strength. Wisdom has the advantage of giving success.

Why is there a price in the hand of a fool to buy wisdom,
When he has no sense?

Then he said, ‘This is what I will do: I will tear down my barns and build larger ones, and there I will store all my grain and my goods.

But he forsook the counsel of the elders which they had given him, and consulted with the young men who grew up with him and served him.