Turn it and turn it again for everything is in it / it is an inexhaustible mine of information
Look deep into the Torah, which contains everything. In the question: As you look again and again, you will discover new things.
("Ben Beg Beg says, "Turn it over and turn it over, devour it, and make a plan for it...for you have no good measure of it" - Avot 5:19-22, and also: "And you ate it, old and old...this is the Torah. This desire that was hidden in the house of its treasures from before the six days of Genesis...Israel is commanded to turn it over and turn it over" - Y. Borla/ Kissufim, 247)
Translation
Expression (Hebrew)
הֲפֹךְ בָּהּ וַהֲפֹךְ בָּהּ דְּכֹלָּא בָּהּ
Definition (Hebrew)
עַיֵּן וְהָעֵמֶק בַּתּוֹרָה שֶׁיֵּשׁ בָּהּ הַכֹּל. בְּהַשְׁאָלָה: כְּכָל שֶׁתְּעַיֵּן שׁוּב וָשׁוּב תְּגַלֶּה דְּבָרִים חֲדָשִׁים.
("בֶּן בַּג בַּג אוֹמֵר הֲפֹךְ בָּהּ וַהֲפֹךְ בָּהּ דְּכֻלָּה בָּהּ וּבָהּ תֶּחֱזִי ...שֶׁאֵין לְךָ מִדָּה טוֹבָה הֵימֶנָּה"- אָבוֹת ה יט-כב, וְכֵן:"וַאֲכַלְתֶּם יָשָׁן נוֹשָׁן...זוֹ הַתּוֹרָה.חֶמְדָּה זוֹ שֶׁהָיְתָה גְּנוּזָה בְּבֵית גְּנָזָיו מִלִּפְנֵי שֵׁשֶׁת יְמֵי בְּרֵאשִׁית...מְצֻוִּים יִשְׂרָאֵל לַהֲפֹךְ וְלַהֲפֹךְ בָּהּ"- י.בּוּרְלָא/ כִּסּוּפִים, 247)