shabbos
אֵין מַחְשִׁיכִין. תָּנוּ רַבָּנַן: מַעֲשֶׂה בְּחָסִיד אֶחָד שֶׁנִּפְרְצָה לוֹ פִּרְצָה בְּתוֹךְ שָׂדֵהוּ וְנִמְלַךְ עָלֶיהָ לְגוֹדְרָהּ, וְנִזְכַּר שֶׁשַּׁבָּת הוּא, וְנִמְנַע אוֹתוֹ חָסִיד וְלֹא גְּדָרָהּ, וְנַעֲשָׂה לוֹ נֵס וְעָלְתָה בּוֹ צָלָף, וּמִמֶּנָּה הָיְתָה פַּרְנָסָתוֹ וּפַרְנָסַת אַנְשֵׁי בֵיתוֹ.
for Video Shiur click here to listen: Psychology of the DAF Shabbos 150
We learned in the mishna that one may not wait for nightfall at the edge of the Shabbat boundary in order to hire workers or bring produce from outside of the boundary immediately after Shabbat. The Sages taught: There was an incident with a pious man in which a breach was made in the fence around his field, and when he saw it he decided to fence it in. And then he remembered that it was Shabbat. And that pious man refrained from fixing the fence forever because he had thought about fixing it on Shabbat. And a miracle was done for him, and a caper bush grew in the breach, thereby closing it up. And from it and its produce he then received his livelihood and the livelihood of the members of his household.
אור החיים שמות כ:ט
עוד ירצה לצוות לבל יחשוב במלאכת חול בשבת, והוא אומרו ששת ימים וגו' ויהיה בעיניך כאלו עשית כבר כל מלאכתך שיש לך לעשות, והוא על דרך אומרם ז''ל (מכילתא) שבות כאלו מלאכתך עשויה, שזולת זה יחשוב מחשבות לכונן מלאכתו ואשר יחסר מהמלאכה לעשותה בחול, וצא ולמד ממעשה החסיד (שבת ק''נ:) שקנס עצמו על אשר חשב לגדור גדר נפרץ בשבת לבל יבנהו עוד וכו':
Another aspect of the phrase
ששת ימים is that once the Sabbath arrives you are to feel that the work week is over; you are not to think about work you have not been able to complete last week and have to continue next week, etc. The domain called ששת ימים and the domain called שבת are mutually exclusive. The author refers the reader to a story related in Shabbat 150 of someone who imposed a penalty on himself for having contemplated repairing a fence which had collapsed on the Sabbath. As a result of his decision not to repair the fence and thereby to expose himself to serious financial loss, a miracle happened and in the place where the break had occurred a caper bush grew which provided him and his family with an adequate income forthwith so that he did not need to restore the breach in the fence.
Unusual loshon in shabbos zimra, the ריבון כל העולמים we say Friday night
מוֹדֶה אֲנִי לְפָנֶיךָ יְיָ אֱלֹהַי וֵאלֹהֵי אֲבוֹתַי. עַל כָּל הַחֶסֶד אֲשֶׁר עָשִׂיתָ עִמָּדִי וַאֲשֶׁר אַתָּה עָתִיד לַעֲשׂוֹת עִמִּי וְעָם כָּל בְּנֵי בֵּיתִי וְעָם כָּל בְּרִיּוֹתֶיךָ בְּנֵי בְּרִיתִי.
To my knowledge it is the only prayer we we thank God for something that he will do instead of something that he did. Ordinarily this would be partially dishonest. There is a special focus on precision and honesty in prayer. (See for example Mishna Berura 46:33, 197:24, 582:16, 591:12.Baer Heytev 475:9, Magen Avrohom 299:9).
Therefore, it would seem that this exception is in order to create a state of feeling as if everything was accomplished by the time Shabbos arrived in line with what the Ohr Hachaim said. That is, if we come into Shabbos convincing ourselves that all our work is complete, we then are not saying falsehood by thanking Hashem for what he WILL do, since as far as we are concerned, all of our needs have been taken care of.
for Video Shiur click here to listen: Psychology of the DAF Shabbos 150
Translations Courtesy of Sefaria
Photo Abba Mari Rav Chaim Feuerman, Ed.D. ZT"L Leiyluy Nishmaso
Translations Courtesy of Sefaria, except when, sometimes, I disagree with the translation 
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