'Observed' in the Bible

I have observed the burden that God has given to people to keep them occupied.

Again, I observed this on the earth: the race is not always won by the swiftest, the battle is not always won by the strongest; prosperity does not always belong to those who are the wisest, wealth does not always belong to those who are the most discerning, nor does success always come to those with the most knowledge -- for time and chance may overcome them all.

This is what I also observed about wisdom on earth, and it is a great burden to me: