Ecclesiastes 1:17
And I gave my heart to know wisdom and knowledge and to know folly and those who are mad; I learned in the end that this also is vexation of spirit.
Ecclesiastes 2:3
I proposed in my heart to regale my flesh with wine and that my heart would walk in wisdom; and to lay hold on folly, until I might see what was that good for the sons of men, which they should do under the heaven all the days of their life.
Ecclesiastes 1:13-14
And I gave my heart to seek and search out by wisdom concerning all things that are done under heaven (this sore travail God has given to the sons of man that they be occupied in it).
Ecclesiastes 2:10-12
And whatever my eyes desired I did not keep from them; I did not withhold my heart from any pleasure; for my heart rejoiced in all my labour, and this was my portion of all my labour.
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
Examine all things; retain that which is good.