Tehillim (103:20) בָּרְכ֥וּ י״י֗ מַלְאָ֫כָ֥יו גִּבֹּ֣רֵי כֹ֭חַ עֹשֵׂ֣י דְבָר֑וֹ לִ֝שְׁמֹ֗עַ בְּק֣וֹל דְּבָרֽוֹ. The midrash Vayikra comments on this possuk (1:1) גִּבֹּרֵי כֹחַ עֹשֵׂי דְבָרוֹ, בַּמֶּה הַכָּתוּב מְדַבֵּר, אָמַר רַבִּי יִצְחָק בְּשׁוֹמְרֵי שְׁבִיעִית הַכָּתוּב מְדַבֵּר, בְּנֹהַג שֶׁבָּעוֹלָם אָדָם עוֹשֶׂה מִצְוָה לְיוֹם אֶחָד, לְשַׁבָּת אֶחָת, לְחֹדֶשׁ אֶחָד, שֶׁמָּא לִשְׁאָר יְמוֹת הַשָּׁנָה, וְדֵין חָמֵי חַקְלֵיהּ בָּיְרָה כַּרְמֵיהּ בָּיְרָה וְיָהֵב אַרְנוֹנָא וְשָׁתִיק, יֵשׁ לְךָ גִּבּוֹר גָּדוֹל מִזֶּה.... עֹשֵׂי דְבָרוֹ, רַבִּי הוּנָא בְּשֵׁם רַבִּי אַחָא אָמַר בְּיִשְׂרָאֵל שֶׁעָמְדוּ לִפְנֵי הַר סִינַי הַכָּתוּב מְדַבֵּר שֶׁהִקְדִּימוּ עֲשִׂיָּה לִשְׁמִיעָה וְאָמְרֵי (שמות כד, ז): כֹּל אֲשֶׁר דִּבֶּר ה' נַעֲשֶׂה וְנִשְׁמָע. Chazal are telling us that there are two times Klal Yisroel are called מלאכיםת anglels at the time of accepting the Torah and when keeping shemmitah. Why are these two called reaching the level of angles and what are we to learn from this?
Midrash Bamidbar (2:3) וְכֵן הוּא אוֹמֵר (תהלים כ, ו): נְרַנְּנָה בִּישׁוּעָתֶךָ וגו', אָמַר לָהֶם הַקָּדוֹשׁ בָּרוּךְ הוּא מַה נִּתְאַוִּיתֶם לַעֲשׂוֹת דְּגָלִים, חַיֵּיכֶם שֶׁאֲנִי מְמַלֵּא מִשְׁאֲלוֹתֵיכֶם, (תהלים כ, ו): יְמַלֵּא ה' כָּל מִשְׁאֲלוֹתֶיךָ, מִיָּד הוֹדִיעַ הַקָּדוֹשׁ בָּרוּךְ הוּא אוֹתָם לְיִשְׂרָאֵל וְאָמַר לְמשֶׁה לֵךְ עֲשֵׂה אוֹתָם דְּגָלִים כְּמוֹ שֶׁנִּתְאַוּוּ. How is getting a דגל considered fulfilling all of a person's desires?
The Sfas Emes (Bamidbar 5638) explains that a malach has a specific identity which is defined by its task. The malach understands what his mission, his identity is that is symbolized by its דגל. What a person's desires really all stem from is one request. A person wants to know what their purpose, mission, תפקיד in life is. A person wants to know what their identity is, what their meaning in life is.
Why did Klal Yisroel ask for this only after seeing the angles' דגלים? Because one gets distracted from what a person really wants to know. A person searches for all sorts of other things and loses focus of what they really want. It was seeing the clarity of the דגלים of the malachim that arouse Klal Yisroel to realize this is what they wanted. This sense of mission at times can become awakened within the individual. One of these times was at Har Sinai when Klal Yisroel had such a clarity as to what was expected of them that they burst out in נעשה ונשמה. In a shmittah year as well the farmer has no distractions of working the field, he is able to take a year off to stay focused on his true mission in life, to learn Torah and come closer to Hashem (see Sfas Emes Behar 5638, 5660.)
The Gemarah Shabbat (88a) says at the time of saying נעשה ונשמע a bat kol came out and proclaimed, "מי גילה רז זה לבני." Why is it called a רז, a secret? The Gemarah Berachot (58a) says when one sees 600,000 Jews one recites a beracha of חכם הרזים. Rashi explains because everyone thinks differently but Hashem knows the thoughts of everyone. The Maharsha says the different secrets are the different parts of Torah that there are which everyone has one implanted within themselves. This is the mission of every individual; to bring out their own part of Torah. That is the secret within a person. When a person has the clarity to recognize that they have their own mission, their own part of Torah, that is revealing the secret.
Chazal in the Pesiktah say on the possuk (Devarim 5:4) פנים בפנים דבר ה' עמכם that it means every one saw their own face like looking in a mirror. The Sfas Emes (Shavuot 5639) explains this means every one saw their own portion in Torah, "מתגלה אליו פנימיות חלקו בתורה דיש לכל נפש ישראל חלק בתורה." This was the revealed secret. Every Shavuot we are giving the ability to take a step back and recalibarate our focus to be on finding our own portion in Torah (based upon a shmuzz by Rabbi Elefant.)