People who are mentally healthy, according to menninger clinic study, gets their simulation from their varieties of sources, not just one or two. Sometimes people are tempted to be narrow-spending all their time talking to anybody.
Frank Gaebelein, however, was an example of vigorous mental health. He was a Christian, a scholar, a mountain climber, a musician. He drew from varied experiences. To me, he's a great illustration of a matured leader.
In addition, its helpful to write down experiences, lest we forget them and loose their benefit. Leaders find that having and recording a wide variety of experiences is immensely helpful to their vitality.