1 He seems to say nothing of wine-presses in the text of the Psalm of which this is the title. By which it appears, that one and the same thing is often signified in Scripture by many and various similitudes. We may then take wine-presses to be Churches, on the same principle by which we understand also by a threshing-floor the Church. For whether in the threshing-floor, or in the wine-press, there is nothing else done but the clearing the produce of its covering; which is necessary, both for its first growth and increase, and arrival at the maturity either of the harvest or the vintage.
Of these coverings or supporters then; that is, of chaff, on the threshing-floor, the grain; and of husks, in the presses, the wine is stripped: as in the Churches, from the multitude of worldly men, which is collected together with the good, for whose birth and adaptating to the divine word that multitude was necessary, this is effected, that by spiritual love they be separated through the operation of God's ministers. For now so it is that the good are, for a time, separated from the bad, not in space, but in affection: although they have converse together in the Churches, as far as respects bodily presence.
But another time will come, the grain will be stored up apart in the granaries, and the wine in the cellars. “The wheat,” says he, “He will lay up in garners; but the chaff He will burn with fire unquenchable.” The same thing may be thus understood in another similitude: the wine He will lay up in cellars, but the husks He will cast forth to cattle: so that by the bellies of the cattle we may be allowed by way of similitude to understand the pains of hell.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)