1)
What is "Ruchi"?
1.
Rashi citing Targum Yonasan: My Kadosh Ru'ach.
2)
How will Hashem cause us to go in His Chukim and guard His Mishpatim?
1.
Malbim: Via the miracles that I will do constantly among you, and the dwelling of Ru'ach ha'Kodesh, you will receive a new nature that leans towards Kedushah and Taharah.
