They shall inherit the earth.”
μακάριοι οἱ πραεῖς, ὅτι αὐτοὶ κληρονομήσουσιν τὴν γῆν.
Matthew relied heavily on Psalm 37:11 here, where the psalmist said that they should be patient with Yahweh. They were not to be angry. The meek (οἱ πραεῖς), the humble ones, those who wait patiently on Yahweh, their God, would inherit the earth (ὅτι αὐτοὶ κληρονομήσουσιν τὴν γῆν), the holy land of Israel. You have to wait a little bit, but the wicked would be no more. The meek, on the other hand, would inherit the holy land, where they would live in abundant prosperity, if only they waited. They would be the happy, blessed, and fortunate ones (μακάριοι).