We hear so much about how happiness is tangential to the Christian life; one eminent Russian Orthodox priest has gone record to say, "It is not correct to say that Our Lord was born to make anyone 'happy.'"
Why ever not??? Certainly He was born to make us happy, something which is part of our theosis, becoming gods by grace. He was born to make us happy and joyful, because that is Who He Is of Whose divine nature we are called to partake... as we sang tonight at the Vesperal Liturgy for the Feast of the Dormition:
"O Joyful Light of the holy glory of the immortal Father, the heavenly, holy, blessed, O Jesus Christ. Now that we have reached the setting of the sun and behold the evening light, we sing to God: Father, Son, and Holy Spirit. It is fitting at all times to praise you with happy voices, O Son of God, the Giver of life. Behold, the world sings your glory."