ל"ה - הלכות נחלות ד:ג
(Painting by Marc Chagall)
One must have perfect faith in Hashem - believing that He is the Creator of everything, that He controls and watches over everything, and that He has the power to change the course of events in any way He wishes and bless us with everything good.
And, just as one must have perfect faith in Hashem, so too must one have perfect faith in oneself. One must have perfect faith that Hashem listens and attends to every single word spoken by every single Jew - even the lowest of the low. Every single Jew has the power to accomplish what he needs through praying to Hashem truly and sincerely, as it is written, "Hashem is close to all who call Him." (Psalms 14:18)