What are the fundamental tests for discovering men of great spirituality, since some are reported to behave like insane people?

Devotee:  What are the fundamental tests for discovering men of great spirituality, since some are reported to behave like insane people?

Ramana Maharishi:  The jnani’s mind is known only to the Jnani. One must be a Jnani oneself in order to understand another Jnani. However the peace of mind which permeates the saint’s atmosphere is the only means by which the seeker understands the greatness of the saint. His words or actions or appearance are no indications of his greatness, for they are ordinarily beyond the comprehension of common people.