Mah shmittah with all its details was from sinai, so to all the mitzvos....R' Moshe explains the exemplary clarity of shmittah being from Hashem was because it was indeniable. People would literally see the miraculous blessing each 6th yr of the cycle. Noone could be mistaken.
However he adds nowadays that we don't have that miracle anymore, we must strengthen our emunah to not have questions in the first place, & this is done only through living a life of kedusha by not allowng ourselve to sink into matterialism which clouds our vision & allows room for mistake.
There seems to be something missing here. Why doesn't R' Moshe say nowadays we have the intelectual proof that no one else besides for the Creator could make the promise of the 6th yr blessing (& expect the mation to exist faithfully for more that 6 yrs) So obviously, the Torah is from Hashem! Why does R' Moshe resort to kedusha?
very simply, our bodies speak more louder to us than our mind. As much intelectual proof as there may be, our addiction to the material world & its desires will allow for confusion & blindness.
We must practice self restriction & be kedoshim, with that we can approach Har sinai.
