Ecclesiastes 1:17
I applied my heart to know wisdom, and to know madness and folly. I perceived that this also was a chasing after wind.
Ecclesiastes 2:3
I searched in my heart how to cheer my flesh with wine, my heart yet guiding me with wisdom, and how to lay hold of folly, until I might see what it was good for the sons of men that they should do under heaven all the days of their lives.
Ecclesiastes 1:13-14
I applied my heart to seek and to search out by wisdom concerning all that is done under the sky. It is a heavy burden that God has given to the sons of men to be afflicted with.
Ecclesiastes 2:10-12
Whatever my eyes desired, I did not keep from them. I did not withhold my heart from any joy, for my heart rejoiced because of all my labor, and this was my portion from all my labor.
Ecclesiastes 7:23-25
All this have I proved in wisdom. I said, "I will be wise;" but it was far from me.
1 Thessalonians 5:21
but test all things; hold firmly that which is good.