What evil did the Arum see?
Rashi: He saw the punishment for an Aveirah.
Rashi (27:12): He sees punishments coming on the land.
Malbim: An Arum is not a Chacham who knows the laws of Chachmah. Even so, astuteness teaches him to understand the way that he goes on, if it will cause a loss to him - "Chachmas Arum Hevin Darko" (14:8). He weighs if it will bring evil to him in the future. He sees that evil.
Why did he hide?
Rashi: He did not transgress.
R. Yonah: Before it said that Chachmah and Gevurah do not save from a decree, and all the more so wealth, which is lower than them. It is an occurrence that encountered the Ashir, just like it encountered the Oni. Now it teaches that Chachmah saves more than Gevurah and wealth. Even though Chachmah does not save from a decree, and "Ein Chachmah
What is the meaning of "u'Fesayim Avru v'Ne'enashu"?
Rashi (27:12): The Pesayim did not hide, rather, they passed in the bad path, and they lost.
R. Yonah (from Eruvin 13b): Anyone who pushes the time (strives to get something before it is proper for him), the time rejects him (he will not get it).
Mesilas Yesharim (Perek 3): Physicality of this world stops a person from seeing pitfalls in the ways of the world. It turns out that Pesayim go confidently, and they fall and perish without prior fear.
Malbim Pesi is the opposite of Arum. Not only does he not look and beware of future evil - he even goes to present evil. In addition to receiving the evil, he is punished for not being careful.
