For every creature of God is good. — To teach that anything created was unclean would be an insult to the Creator. The very fact of its being His creation is enough. If made by God, then it must be good.
And nothing to be refused, if it be received with thanksgiving. — Every kind of food and drink may become hateful in the eyes of the all-pure God if misused, if partaken of without any sense of gratitude to the Divine giver. But nothing which can be made use of as food ought to be regarded as unclean or as polluted; every kind of food is intended for man, the only condition being that whatever is partaken of should be gratefully received by him as a gift.