Regarding Shemitta, the sabbatical year, the pasuk says : וַיְדַבֵּר יְ־הֹוָ־ה אֶל מֹשֶׁה בְּהַר סִינַי לֵאמֹר – (25:1)
Rashi explains that in the same way that Shemitta was taught in detail at Sinai, all other mitzvos were taught in the same way.
Shemitta is a key mitzva, much like Shabbos, which is a reference point for other mitzvos. Through the performance of key mitzvos, we find a gateway to the performance of all others. The Sfas Emes explains that Shemitta here is truly the reference point for all mitzvos, utilising the above Rashi.
The pasuk (25:2) says כִּי תָבֹאוּ אֶל הָאָרֶץ – When you come to the land. The Torah says this many times in Chumash – that is to say that when the Jews get to Eretz Yisrael, the reason the land is given is to fulfil God’s will.
The way the Jews have freedom in the the land is solely in this way – through marginalising themselves and their egos, by subjugating themselves to Hashem. In the case of Shemitta, the subjugation manifests itself that we are told to refrain from working the land. The reason this is so is that people become enslaved by their work – it consumes them, and it becomes them. These people do not and cannot stop. The Sfas Emes explains that this concept enables us to serve Hashem – from being released from all consuming work, we can devote our strength to the same extent to His service.
This is why we were sent to Egypt, and why we were released. There must be a burden in order for us to realise how much we can carry – one the burden is removed, we can carry our faith freely. The Sfas Emes compares this to our eternal struggle with the Yetzer Hara, and why it starts immediately. In the same way, Eretz Canaan had to have idolatry and immorality to the degree that it’s inhabitants had to be destroyed, in order for it to become Eretz Yisrael, containing the Beis HaMikdash. This concept manifests itself freely.
The point of Shemitta and Shabbos is to bear witness that Hashem sustains existence anew every day. We say every morning that Hashem is ברוך אומר ועושה – Hashem says, and Hashem does. The Sfas Emes explains that Hashem said, and created something from nothing – but Hashem also does, every day, now that Creation exists, maintains it.
The Sfas Emes develops this further, and says that the same is true of mitzvos. Every mitzva we do should arouse and inspire us – every day. The life we get from a mitzva’s performance should be anew each time, and the same with Torah. The Sfas Emes teaches us that the preparation and freshness, of everything, only serves to enable what comes after.