Ecclesiastes 1:17
And I gave my heart to know wisdom and to know madness and folly; I know that this also is vexation of spirit.
Ecclesiastes 2:3
I sought in my heart to drag my flesh with wine, yet leading my heart with wisdom; and to lay hold on folly, until I might see where the good for the sons of men might be, what they should do under the heavens all the days of their life.
Ecclesiastes 1:13-14
And I gave my heart to seek and search out by wisdom concerning all which is done under the heavens. It is a sad task God has given to the sons of men to be humbled by it.
Ecclesiastes 2:10-12
And whatever my eyes desired I did not keep from them; I did not withhold my heart from any joy; for my heart rejoiced in all my labor, and this was my part of all my labor.
Ecclesiastes 7:23-25
All this I have proved by wisdom; I said, I will be wise; but it was far from me.
1 Thessalonians 5:21
Prove all things, hold fast to the good.