John Chrysostom — as excerpted in the Catena Aurea on Matthew 5:5

“Otherwise; Christ here has mixed things sensible with things spiritual. Because it is commonly supposed that he who is meek loses all that he possesses, Christ here gives a contrary promise, that he who is not forward shall possess his own in security, but that he of a contrary disposition many times loses his soul and his paternal inheritance. But because the Prophet had said, The meek shall inherit the earth, (Ps. 36:11.) He used these well-known words in conveying His meaning.”