Why We Must Offer to God a SPIRITUAL Service

All creatures serve man, by the providential order of God, with the best they have. As we, by God's appointment, receive from creatures the best they can give, ought we not with a free will render to God the best we can offer? The beasts give us their best fat, the trees their best fruit, the sun its best light, the fountains their best streams: shall God order us the best from creatures, and we put him off with the worst from ourselves