His secret is not like his public self
What he hides is not like what he reveals. He is not sincere in his words. 'His mouth and his heart are not the same.'
("And the Lord saw that Leah was hated" (Genesis 29:31) – everyone criticized her... they would say: 'Her secret is not like her public self, she appears righteous but is not righteous' – Genesis Rabbah 71:2. Also: 'Sonia thinks about Yael Hayot, whose secret is not like her public self, her face is as it appears... but her heart is full of deceit' – Agnon, Only Yesterday, p. 348.)
Translation
Expression (Hebrew)
אֵין סִיתְרוֹ כְּגִּלוּיוֹ
Definition (Hebrew)
הוּא אֵינוֹ בֶּאֱמֶת כְּפִי שֶׁהוּא נִרְאֶה. הַדְּבָרִים שֶׁהוּא מַסְתִּיר אֵינָם כְּמוֹ מָה שֶׁמְּגַלֶּה. 'פִּיו וְלִבּוֹ אֵינָם שָׁוִים'.
("וַיַּרְא ה' כִּי שְׂנוּאָה לֵאָה(בְּרֵאשִׁית כט לֹא)"-שֶׁהָיוּ הַכֹּל סָנְטֵן בָּהּ...אוֹמְרִים:אֵין סִתְרָהּ כְּגִלּוּיָהּ, נִרְאֵית צָדַקְתָּ וְאֵינָהּ צָדַקְתָּ"- בְּרֵאשִׁית רַבָּה עא ע"ב, וְכֵן:"סוֹנְיָה מְהַרְהֶרֶת עַל יָעֵל חַיּוֹת, שֶׁאֵין סִתְרָהּ כְּגִלּוּיָהּ, פַנְיָה כִּפְנֵי...וְלִבָּהּ מָלֵא רְמִיּוֹת"- עַגְנוֹן/ תְּמוֹל שִׁלְשׁוֹם, 348 )