"He was despised and rejected by men; a man of sorrows, and acquainted with grief; and as one from whom men hide their faces he was despised and we esteemed him not. Surely he has borne our griefs and carried away our sorrows; yet we esteemed him stricken, smitten by God, and afflicted. But he was wounded for our transgressions; he was crushed for our iniquities; upon him was the chastisement that brought us peace, and with his stripes we are healed. All we like sheep have gone astray; we have turned every one to his own way; and the LORD has laid on him the iniquity of us all." - Isaiah 53:3-6
"He is the image of the invisible God, the firstborn of all creation. For by him all things were created, in heaven and on earth, visible and invisible, whether thrones or dominions or rulers or authorities - all things were created through him and for him. And he is before all things, and in him all things hold together. And he is the head of the body, the church. He is the beginning, the firstborn from the dead, that in everything he might be preeminent. For in him all the fullness of God was pleased to dwell, and through him to reconcile to himself all things, whether on earth or in heaven, making peace by the blood of his cross." - Colossians 1:15-20
"If we say we have no sin, we deceive ourselves, and the truth is not in us. If we confess our sins, he is faithful and just to forgive us our sins and to cleanse us from all unrighteousness. And we have seen and testify that the Father has sent his Son to be the Savior of the world. Whoever confesses that Jesus is the Son of God, God abides in him, and he in God. So we have come to know and to believe the love that God has for us. God is love, and whoever abides in love abides in God, and God abides in him." - 1 John 1:8-9, 4:14-16
Good Friday is a day of mourning how much my rescue has cost a loving God. It's also a day of rejoicing. A day of rejoicing that the Father takes seriously the sickness, sin, death, brokeness and suffering that abounds in this world. He takes it seriously and has dealt with it in a way that is costly to himself. Death dies in the death of Jesus. The Father upholds justice while showering the world with love and mercy.
So yeah, today for me is one of mourning and rejoicing.