December 17O Wisdom of our God Most High,
guiding creation with power and love:
come to teach us the path of knowledge!
December 18O Leader of the House of Israel,
giver of the Law to Moses on Sinai:
come to rescue us with your mighty power!
The Church has been using these antiphons in the Divine Office and in the Liturgy since around the eighth century. You can see that they heighten our desire and repeat the urgent invitation to come - come teach us, come rescue us. Reverend Mother Stuart wrote some beautiful meditations on the O Antiphons.
I will leave you to write your own this year!