To ascend the mountain of Hashem, it is necessary not only to have good deeds, but also to have a perfection of character, which we call middos...
Regarding Noach, we find an expression in the Torah,"‘Tamim hayah bidorosav.’ Noach was a tzaddik, but besides tzaddik, he was tamim. Tamim means a perfect tzaddik.: not only were his deeds good, not only did he do righteous acts, but he was a perfect in his character. — Midos: Whom Hashem Chooses (#544)