Sarah is the Matriarch of the Jewish people. Tradition ascribes superiority to her Divine Inspiration over Avraham's.
The Sod Yesharim suggests a very powerful practice to get the most out of our highest of holy days, Yom Kippur. (Sod Yesharim is the third Rebbe in the Ishbitz line of chassidut. He wrote in the mid/late 1800's).