1 Felix the Martyr, truly Felix, i.e. “Happy” both in his name and his crown, whose birthday this is, despised the world. Was he, because he feared the Lord, thence happy, thence blessed, because his wife was as a fruitful vine upon the earth, and his children stood around his table? All these blessings he has perfectly, but in the Body of Him who is here described; and, because he understood them in this sense, he scorned things present, that he might receive things future. You are aware, brethren, that he suffered not the death that other martyrs suffered. For he confessed, and was set aside for torments; on another day his body was discovered lifeless. They had closed the prison to his body, not to his spirit. The executioners found him gone; when they were preparing to torture, they spent their rage for nought. He was lying dead, without sense to them, that he might not be tortured; with sense with God, that he might be crowned. Whence was he also happy, brethren, not only in name, but in the reward of everlasting life, if he loved these things.
2. “Blessed are all they that fear the Lord, and walk in His ways”. He speaks to many; but since these many are one in Christ, in the next words he speaks in the singular: “For you shall eat the labours of your fruits.”...When I speak of Christians in the plural, I understand one in the One Christ. You are therefore many, and you are one; we are many, and we are one. How are we many, and yet one? Because we cling unto Him whose members we are; and since our Head is in heaven, that His members may follow....Let us therefore so hear this Psalm, as considering it to be spoken of Christ: and all of us who cling unto the Body of Christ, and have been made members of Christ, walk in the ways of the Lord; and let us fear the Lord with a chaste fear, with a fear that abides for ever....
3. “You shall eat the labours of your fruits”. 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;” 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?
Source: The Enarrations, or Expositions, on the Psalms (New Advent)