On June 24, the Church observes a solemn feast in honor of the birth or nativity of John the Baptist.  No other saint's birthday is celebrated with such solemnity.  The unique role of the Forerunner, the Voice crying out in the Wilderness, in the history of salvation is part of the reason.  But also the Church wants to draw our attention to the witness of John's character.  It teaches us much about the path to holiness and the Kingdom of God.