Albert Barnes Commentary Ecclesiastes 4:1

"Then I returned and saw all the oppressions that are done under the sun: and, behold, the tears of such as were oppressed, and they had no comforter; and on the side of their oppressors there was power; but they had no comforter." — Ecclesiastes 4:1 (ASV)

So I returned, and considered - Rather, And I returned and saw. He turns to look upon other phenomena, and to test his previous conclusion by them.

Oppressed - See the introduction to Ecclesiastes.