Hilary of Poitiers
Catena Aurea · Matthäusevangelium 5
Mt 5, Verses 1–3English original
And seeing the multitudes, He went up into a mountain: and when He was set, His disciples came unto Him. And He opened His mouth, and taught them, saying, Blessed are the poor in spirit: for theirs is the kingdom of heaven.
Or, He ascends the mountain, because it is placed in the loftiness of His Father’s Majesty that He gives the commands of heavenly life.