But one of them, seeing that he was made clean, returned, with a loud voice glorifying God, and he fell on his face at His feet, giving thanks; and he was a Samaritan.
Luke 17:11-19
It would be a monstrous ingratitude to receive daily many blessings of the Divine Goodness, and not to acknowledge your gratitude, if not in deeds, at any rate, in words and canticles. Besides that, if this gratitude is due to Him, it is no less advantageous to ourselves. God has no need of us, but we have every need of Him.
St John Chrysostom
We ought to imitate the liberality of the soil, which repays, with usurious interest, the smallest seed that is sown therein. Holy Scripture compares an ungrateful person to a field or vine, which remains barren if not carefully cultivated, on the other hand, a grateful man is like a fruitful field, and which increases in value a hundred-fold.
St Ambrose
It is not every one who has the power of doing good, but we can always show our gratitude, for ingratitude is an unpardonable vice.
St Ambrose
A faithful and truly grateful soul ought to imitate the conduct of that prince mentioned in the Book of Esther, where it is said that he wrote down and kept an account of all the services his brave followers had done for him during his reign, in order that, by reading of them often, he was forced to acknowledge them. This is what a faithful soul should do, in order to remind him of the many graces and favours God has bestowed upon him during the whole course of his life.
Fr Louis Bourdaloue (1632 – 1704)
For those who cross by the Bridge, being still in the darkness of the body, find light, and, being mortal, find immortal life, tasting, through love, the light of Eternal Truth which promises refreshment to him who wearies himself for Me, who am grateful and just, and render to every man according as he deserves. Wherefore every good deed is rewarded, and every fault is punished.
The Dialogue of St Catherine of Siena
AnaStpaul 