Whatever its origin, the current name of this holy day offers a fitting lesson to those of us who assume (as is easy to do) that "good" must mean "happy." We find it hard to imagine a day marked by sadness as a good day.
Of course, the church has always understood that the day commemorated on Good Friday was anything but happy. Sadness, mourning, fasting, and prayer have been its focus since the early centuries of the church. A fourth-century church manual, the Apostolic Constitutions, called Good Friday a "day of mourning, not a day of festive Joy." Ambrose, the fourth-century archbishop who befriended the notorious sinner Augustine of Hippo before his conversion, called it the "day of bitterness on which we fast."
Good Friday has always challenged merely human goodness. Its sad commemoration reminds us that in the face of sin, our goodness avails nothing. Only One is good enough to save us. That He did so is cause indeed for celebration.