Torah Temimah citing Rosh Hashanah 21b: He wanted to be like Moshe. A Bas Kol (voice from Heaven) told him "v'Chasuv Yosher Divrei Emes" - "v'Lo Kam Navi Od b'Yisrael k'Moshe" (Devarim 34:10).

Rav Sadya Gaon: In everything, his intent was to reach what is desired, what is written straightly and is truly accepted.

Rashi: He put to his heart to the matter, and found

Rashi: They are traditions from Sinai ¹ . Rid - and Gezeiros Shavos ² , Kal v'Chomer and all the Kabalos in the Mishnah and Talmud. In the days of the Nevi'im, they were learned orally.

Ibn Ezra: It is supreme Chachmah - why matters were created the way they were.

Rashbam: Good things of desire.

Rashi: They are written Torah and Nevi'im ¹ .

Rashbam: He wanted to write Seforim of straight words and Emes.

Rid: Divrei Emes are Divrei Torah. He wanted to write them straightly, lest people stumble in them. If not for [Divrei Chefetz - refer to 12:10:2:1], people would not understand Torah properly.

Metzudas David: He sought what is written straight, without fraud, and Emes without mistake. From this, he understood what he understood.