What virtue does the eldest son lack in the parable of the prodigal son?

In the parable of the prodigal son, the eldest son lacks the virtue of compassion. Instead of showing understanding and forgiveness towards his brother, who returns after squandering his inheritance, the eldest son feels resentment and jealousy. His inability to celebrate his brother's return reflects a lack of empathy and an unwillingness to embrace reconciliation within the family. This highlights a deeper moral lesson about the importance of love and acceptance over rigid adherence to rules and entitlement.