You want to Shteig In Ruchaniyus? Look how the whole tragedy of Korach was based on growing in Ruchaniyus! If you want to grow in Ruchaniyus, try to grow in being more and more Sameach B'chelko!
Story
R’ Ahron Kotler Zatzal once spoke in public before American Baalei Battim, and he mentioned the concept of “learning Torah all your life like the Ziknei Yerushalayim”. A prominent person heckled him, and wisecracked: “Rabbi, so why don’t you go to Yerushalayim?” R’ Ahron responded: “I am in America since that is where most of Klal Yisroel is”.
A Truly Happy Person Isn’t Sensitive
When I heard this story [directly from a Talmid of R’ Ahron] I asked him: Wasn’t R’ Ahron upset over such chutzpa? He answered that R’ Ahron was simply in a different world, and he felt no pain of embarrassment.
A Gabbai of the Kapitchnitzer Rebbe told me that the Rebbe was totally not a sensitive person. Even when the Nazis Y'mach Sh'mam forced him to be M'vazeh himself by cleaning the streets of Vienna, all he said was: What a Zechus it is to clean Hashem’s beautiful world!
The Rebbe’s main “Peckel” in life was: How can I thank Hashem properly after so much never-ending goodness going on in my life?