"On this same occasion the Master talked to the group about the desirability of possessing well-balanced characters. He recognized that it was necessary for most men to devote themselves to the mastery of some vocation, but he deplored all tendency toward overspecialization, toward becoming narrow-minded and circumscribed in life’s activities. He called attention to the fact that any virtue, if carried to extremes, may become a vice. Jesus always preached temperance and taught consistency—proportionate adjustment of life problems. He pointed out that overmuch sympathy and pity may degenerate into serious emotional instability; that enthusiasm may drive on into fanaticism. He discussed one of their former associates whose imagination had led him off into visionary and impractical undertakings. At the same time he warned them against the dangers of the dullness of overconservative mediocrity."

~ The Urantia Book, (149:4.3)

Source:

https://www.urantia.org/urantia-book-standardized/paper-149-second-preaching-tour