John Chrysostom — as excerpted in the Catena Aurea on Luke 21:1-4

“(Hom. 1. in Ep. ad Heb., Hom. 28.) For God regarded not the scantiness of the offering, but the overflowing of the affection. Almsgiving is not the bestowing a few things out of many, but it is that of the widow emptying, herself of her whole substance. But if you cannot offer as much as the widow, at least give all that remains over.”