A PMHNP is facilitating a process-oriented group therapy session for adults with depression. During the session, a 38-year-old woman tearfully shares that she feels profoundly alone in her suffering and that no one could possibly understand what she is going through. Several other group members respond by sharing their own similar experiences of isolation, hopelessness, and feelings of being misunderstood by friends and family. The patient visibly relaxes and states, 'I had no idea other people felt this way too. I thought it was just me.' Which of Yalom's therapeutic factors is most prominently demonstrated in this interaction?