1 By the return of the commemoration of a holy virgin, who gave her testimony to Christ, and was found worthy of a testimony from Christ, who was put to death openly, and crowned invisibly, I am reminded to speak to you, beloved, on that exhortation which the Lord has just now uttered out of the Gospel, assuring us that there are many sources of a blessed life, which there is not a man that does not wish for. There is not a man surely can be found, who does not wish to be blessed.
But oh! If as men desire the reward, so they would not decline the work that leads to it! Who would not run with all alacrity, were it told him, “You shall be blessed”? Let him then also give a glad and ready ear when it is said, “Blessed, if you shall do thus.” Let not the contest be declined, if the reward be loved; and let the mind be enkindled to an eager execution of the work, by the setting forth of the reward. What we desire, and wish for, and seek, will be hereafter; but what we are ordered to do for the sake of that which will be hereafter, must be now.
Begin now, then, to recall to mind the divine sayings, and the precepts and rewards of the Gospel. “Blessed are the poor in spirit, for theirs is the kingdom of heaven.” The kingdom of heaven shall be yours hereafter; be poor in spirit now. Would you that the kingdom of heaven should be yours hereafter? Look well to yourself whose you are now. Be poor in spirit. You ask me, perhaps, “What is to be poor in spirit?” No one who is puffed up is poor in spirit; therefore he that is lowly is poor in spirit. The kingdom of heaven is exalted; but “he who humbles himself shall be exalted.”
Source: Sermons on Selected Lessons of the New Testament (New Advent)