Bede the Venerable — as excerpted in the Catena Aurea on Luke 21:1-4

“Now mystically, the rich men who cast their gifts into the treasury signify the Jews puffed up with the righteousness of the law; the poor widow, the simplicity of the Church which is called poor, because it has either cast away the spirit of pride, or its sins, as if they were worldly riches. But the Church is a widow, because her Husband endured death for her. She cast two mites into the treasury, because in God’s sight, in whose keeping are all the offerings of our works, she presents her gifts, whether of love to God and her neighbour, or of faith and prayer. And these excel all the works of the proud Jews, for they of their abundance cast into the offerings of God, in that they presume on their righteousness, but the Church casts in all her living, for every thing that hath life she believes to be the gift of God.”