
Ambrose of Milan
Catena Aurea · Matthäusevangelium 5
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.
(De Officiis i. 16.) In the eye of Heaven blessedness begins there where misery begins in human estimation.