The Zohar in parshas Bereishis teaches us that when Hashem created the world, the ultimate reason was for the sixth middah which is YESOD. The word Bereishis  can be read as "Bara Shis" (he created the sixth) which refers to the inyan of kedushas habris. 

What we learn from this zohar is that when a person does something to strengthen himself in keeping clean, he's actually assisting in holding up the world

Chizuk #2

The Zohar in parshas Noach teaches us that in the time that the jews are clean in kedusha, there are no nations that can harm them. All the bad decries that the nations plan will not actualize in the merit of those who stay holy and clean. 

What we learn from this zohar is that when a person does something to strengthen himself in keeping clean he also gets credit for saving many people and the whole world of all bad gezeiros.

Chizuk #3

The Zohar (page 197) writes that every time that someone guards himself and keeps clean, Hashem gives him credit as if he upheld all the mitzvos of the torah because  shmiras habris is as big as all the rest of the torah combined.