'Applied' in the Bible

I applied my mind to seek and explore through wisdom all that is done under heaven. God has given people this miserable task to keep them occupied.

I applied my mind to know wisdom and knowledge, madness and folly; I learned that this too is a pursuit of the wind.

When I applied my mind to know wisdom and to observe the activity that is done on the earth (even though one’s eyes do not close in sleep day or night),