What does preparing the way of the Lord mean?

Gaudete Sunday’s Office of Readings from a sermon of St. Augustine:

“To prepare the way” means to pray well; it means thinking humbly of oneself. We should take our lesson from John the Baptist. He is thought to be the Christ; he declares he is not what they think. He does not take advantage of their mistake to further his own glory.

If he had said, “I am the Christ,” you can imagine how readily he would have been believed, since they believed he was the Christ even before he spoke. But he did not say it; he acknowledged what he was. He pointed out clearly who he was; he humbled himself.

He saw where his salvation lay. He understood that he was a lamp, and his fear was that it might be blown out by the wind of pride.