1. Christ crucified gave us joy. (Est 9:21-28)

In the Old Testament, the enemies died on the same day they decided to kill the people of Israel. The Israelites celebrated this day as the Feast of Purim and rejoiced. (Est 9:21-28)

Est 9:21 To stablish this among them, that they should keep the fourteenth day of the month Adar, and the fifteenth day of the same, yearly,
22 As the days wherein the Jews rested from their enemies, and the month which was turned unto them from sorrow to joy, and from mourning into a good day: that they should make them days of feasting and joy, and of sending portions one to another, and gifts to the poor.
23 And the Jews undertook to do as they had begun, and as Mordecai had written unto them;
24 Because Haman the son of Hammedatha, the Agagite, the enemy of all the Jews, had devised against the Jews to destroy them, and had cast Pur, that is, the lot, to consume them, and to destroy them;
25 But when Esther came before the king, he commanded by letters that his wicked device, which he devised against the Jews, should return upon his own head, and that he and his sons should be hanged on the gallows.
26 Wherefore they called these days Purim after the name of Pur. Therefore for all the words of this letter, and of that which they had seen concerning this matter, and which had come unto them,
27 The Jews ordained, and took upon them, and upon their seed, and upon all such as joined themselves unto them, so as it should not fail, that they would keep these two days according to their writing, and according to their appointed time every year;
28 And that these days should be remembered and kept throughout every generation, every family, every province, and every city; and that these days of Purim should not fail from among the Jews, nor the memorial of them perish from their seed.

God has turned our sorrow into joy. (Psalm 30:11-12, Isa 61:3)

Psalm 30:11 Thou hast turned for me my mourning into dancing: thou hast put off my sackcloth, and girded me with gladness;
12 To the end that my glory may sing praise to thee, and not be silent. O Lord my God, I will give thanks unto thee for ever.

Isa 61:3 To appoint unto them that mourn in Zion, to give unto them beauty for ashes, the oil of joy for mourning, the garment of praise for the spirit of heaviness; that they might be called trees of righteousness, the planting of the Lord, that he might be glorified.

The cross of Christ is the power of God and the wisdom of God. (1 Cor 1:18, 1 Cor 1:23-24)

1 Cor 1:18 For the preaching of the cross is to them that perish foolishness; but unto us which are saved it is the power of God.

1 Cor 1:23 But we preach Christ crucified, unto the Jews a stumblingblock, and unto the Greeks foolishness;
24 But unto them which are called, both Jews and Greeks, Christ the power of God, and the wisdom of God.