According to Osho, the soul does grow—but not as an isolated entity. All souls are interlinked like waves; one may surge ahead and another follow, yet none are separate. When a Buddha or Socrates flowers, all humanity’s soul is uplifted. Your aspiration for others’ growth expands you; our greatness enlarges others, our smallness diminishes all.
We’re all connected like waves or candles—when one person grows brighter, everyone’s light grows a little, and helping others grow also grows you.