“This kingdom Christ promised will be both a physical and spiritual kingdom. Only those who are ‘poor in spirit’ will inherit the kingdom (Matt. 5:3).”

Sermon 346A:6 (c. 399 A.D.) "On the Word of God as Leader of the Christians on Their Pilgrimage," Works of Saint Augustine: A Translation for the 21st Century, III/10, Sermons, 341-400, New City Press, Edmund Hill O.P., trans., (1995), , p. 74. http://books.google.com/books?id=iE30Zob4v98C&pg=PA74&dq=%22But+just+a+minute,+Mr.+Poor+Man;+consider+whether+you+can%22&hl=en&sa=X&ei=-cHUUbqIIJO68wTn-YC4DA&ved=0CC0Q6AEwAA#v=onepage&q=%22But%20just%20a%20minute%2C%20Mr.%20Poor%20Man%3B%20consider%20whether%20you%20can%22&f=false
Sermons
Context: But let us realize what sort of rich people. Here comes heaven knows who across our path, wrapped in rags, and he has been jumping for joy and laughing on hearing it said that the rich man can’t enter the kingdom of heaven; and he’s been saying, “I, though, will enter; that’s what theses rags will earn me; those who treat s badly and insult us, those who bear down hard upon us won’t enter; no, that sort certainly won’t enter. But just a minute, Mr. Poor Man; consider whether you can, in fact, enter. What if you’re poor, and also happen to be greedy? What if you’re sunk in destitution, and at the same time on fire with avarice? So if that’s what you’re like, whoever you are that are poor, it’s not because you haven’t wanted to be rich, but because you haven’t been able to. So God doesn’t inspect your means, but he observes your will. So if that’s what you’re like, leading a bad life, of bad morals, a blasphemer, an adulterer, a drunkard, proud, cross yourself off the list of God’s poor; you won’t be among those of whom it is said, Blessed are the poor in spirit, since theirs is the kingdom of heaven (Mt 5:3).

Source: On the Bondage of the Will (1525), p. 241, 253

On the Sermon on the Mount, as translated by William Findlay (1888), Book I, Ch. 1
Context: What, then, does He say? "Blessed are the poor in spirit, for theirs is the kingdom of heaven." We read in Scripture concerning the striving after temporal things, "All is vanity and presumption of spirit"; but presumption of spirit means audacity and pride: usually also the proud are said to have great spirits; and rightly, inasmuch as the wind also is called spirit. And hence it is written, "Fire, hail, snow, ice, spirit of tempest." But, indeed, who does not know that the proud are spoken of as puffed up, as if swelled out with wind? And hence also that expression of the apostle, "Knowledge puffs up, but charity edifies". And the poor in spirit are rightly understood here, as meaning the humble and God-fearing, i. e. those who have not the spirit which puffs up. Nor ought blessedness to begin at any other point whatever, if indeed it is to attain unto the highest wisdom; "but the fear of the Lord is the beginning of wisdom"; for, on the other hand also, "pride" is entitled "the beginning of all sin." Let the proud, therefore, seek after and love the kingdoms of the earth; but "blessed are the poor in spirit, for theirs is the kingdom of heaven."

Source: Heaven Revealed (Moody, 2011), p. 71

No. 29. (Rica writing to Ibben)
Lettres Persanes (Persian Letters, 1721)

Source: Master and Men (1894), p. 41

Sermon 1

Song, "Sweet are the thoughts that savour of content", line 12, from Farewell to Folly (1591); Dyce p. 309.