Igor Stravinsky loved expressing himself and wrote a good deal on interpretation. As he bore a volcano within him, he urged restraint. Those without even the vestige of a volcano within them nodded in agreement, raised their baton, and observed restraint, while Stravinsky himself conducted his own Apollon Musagete as if it were Tchaikovsky. We who had read him listened and were astonished.

The Magic Lantern by Ingmar Bergman

Most of us are searching—consciously or unconsciously—for a degree of internal balance and harmony between ourselves and the outside world, and if we happen to become aware—like Stravinsky— of a volcano within us, we will compensate by urging restraint. By the same token, someone who bore a glacier within him might urge passionate abandon. The danger is, as Bergman points out, that a glacial personality in need of passionate abandon may read Stravinsky and apply restraint instead.