'Observed' in the Bible

I observed every activity done on earth. My conclusion: all of it is pointless like chasing after the wind.

I said to myself, “Behold, I have magnified and increased wisdom more than all who were over Jerusalem before me; and my mind has observed a wealth of wisdom and knowledge.”

The only worthwhile thing for a human being is to eat, drink, and enjoy life's goodness that he finds in what he accomplishes. This, I observed, is also from the hand of God himself,

I have observed the burdens placed by God on human beings in order to perfect them.

I also observed under the sun: there is wickedness at the place of judgment and there is wickedness at the place of righteousness.

Again, I observed all the acts of oppression being done under the sun. Look at the tears of those who are oppressed; they have no one to comfort them. Power is with those who oppress them; they have no one to comfort them.

I observed everyone who lives and walks on earth, along with the youth who will take the king's place.

I have observed a painful tragedy on earth: Wealth hoarded by its owner harms him,

Look! I observed that it is good and prudent to eat, drink, and enjoy all that is good of a person's work that he does on earth during the limited days of his life, which God gives him, for this is his allotment.

Here is a tragedy I have observed under the sun, and it weighs heavily on humanity:

I observed all this, and carefully considered everything that is undertaken on earth, especially the time when someone dominates another to his detriment.

I observed all the work of God and concluded that man is unable to discover the work that is done under the sun. Even though a man labors hard to explore it, he cannot find it; even if the wise man claims to know it, he is unable to discover it.

I considered and observed on earth the following: The race doesn't go to the swift, nor the battle to the strong, nor food to the wise, nor wealth to the smart, nor recognition to the skilled. Instead, timing and circumstances meet them all.

I have observed that this also is wisdom under the sun, and it is significant to me:

Here's another tragedy that I've observed on earth, a kind of error that comes from an overseer:

And I have observed servants riding on horses, while princes walk on the ground like servants.