Many times, Rebbe Nachman said that no sophistication is needed in serving G-d. All that is required is simplicity, sincerity and emuna (faith).
The Rebbe said that simplicity is the highest possible thing.
God is certainly higher than all else. And God is ultimately Simple.
(Sichot HaRan #101)
As we know from the Sh’ma, G-d is One, totally unique. In any number more than one, we find complexity. But when we deal with a simple, single unit, there is no duplicity and no conflicts exist. Rebbe Nachman implies that when we learn to simplify our lives, we can experience more serenity and tranquility
Adapted from Rebbe Nachman and YOU, by Chaim Kramer