Aside from the fact that faultfinding proves an envious mentality, we should know that envy is the root cause not only of faultfinding, but of our entire existence in this world. If we can simply overturn that envy and transform it into love of Krishna, then we would become pure lovers of God. Again, it’s helpful to understand the various ways in which envy manifests so that we can overcome them one by one. One of the most common is the tendency to find fault.
(Sri Siksastaka-bhasya, Moscow 5.2.2001)