Here followeth the Life of S. Hilary. The interpretation of his name.

Hilary is said of joyousness, for he was joyous in the service of God. Or Hilary is said virtuous and high, for he was high and strong in science, and virtuous in his life. Or Hilary is said of hilum, which is to say dark matter, for he had in his dictes great obscurity and profoundness.