Here in time we make holiday because the eternal birth which our loving God bore and bears unceasingly in eternity is now born in time, in human nature. St. Augustine says this birth is always happening. But if it happens not in me, what does it profit me? What matters is that it shall happen in me.
The whole thing boils down to giving ourselves in prayer a chance to realize that we have what we seek. We don't have to rush after it. It was there all the time, and if we give it time, it will make itself known to us. There is in all this a sense of the unfolding of mystery in time, a reverence for gradual growth.