"You shall eat the labours of your fruits" [Psalm 128:2]. And ye, O thou, you many who are One, "You shall eat of the labours of your fruits." He seems to speak perversely to those who understand not: for he should have said, you shall eat the fruit of your labours. For many eat the fruit of their labours. They labour in the vineyard; they eat not the toil itself; but what arises from their labour they eat. They labour about trees that bear fruit: who would eat labours? But the fruit of these labours, the produce of these trees; it is this that delights the husbandman. What means, "You shall eat the labours of your fruits"? At present we have toils: the fruits will come afterwards. But since their labours themselves are not without joy, on account of the hope whereof we have a little before spoken, "Rejoicing in hope, patient in tribulation;" [Romans 12:12] at present those very labours delight us, and make us joyful in hope. If therefore our toil has been what could be eaten, and could also delight us; what will be the fruit of our labour when eaten? "They who went weeping on their way, scattering their seed," did eat their labours; with how much greater pleasure will they eat the fruits of their labours, who "shall come again with joy, bearing their sheaves with them"?..."Blessed are you, and well shall it be with you." "Blessed are you," is of the present: "well shall it be with you," is of the future. When you eat the labours of your fruits, "blessed are you;" when you have reached the fruit of your labours, "well shall it be with you." What has he said? For if it be well with you, you will be happy: and if you will be happy, you will also have all well with you. But there is a difference between hope and attainment. If hope be so sweet, how much sweeter will reality be?
[AD 430] Augustine of Hippo on Psalms 128:2