Why does it say "Levad Re'e Zeh Matzasi"?
Rashi: Calamity came to the world due to a woman.
Ri Kara, Rid: In addition to the Chachmah that I found.
Seforno: This did not happen [that one Aveirah led to another] before Adam's sin.
Metzudas David: The verse should be re-arranged; it means, Re'e Zeh Levad Matzasi. He contemplated that he found only this - a straight man, without comparing him to an opposite.
In what way did Hashem make man Yashar?
Rashbam: He made him nice; He created him in His image and form.
Ri Kara: He should go in straightness. Metzudas David - he should go in the middle path in Midos, e.g. anger, and, mercy
What many Cheshbonos did people make?
Rav Sadya Gaon: They wanted to find elevated paths of conduct.
Rashi citing a Midrash: When Chavah was made to be a mate for Adam, and they were "Hemah" (two), they had thoughts of sin.
Ibn Ezra: They sought crooked paths.
Rashbam: They are many evil thoughts to veer from Hashem's Mitzvos. This is great evil for man. Cheshbonos is an expression of thoughts.
Rid: They are many evil thoughts that lead them to sin.
Metzudas David: They have many thoughts to go to an extreme. If one leans towards an extreme, Chachamim tell him to lean to the other extreme, in order to come to the middle. This is Yashar, without comparison to others!
