“He was showing how marriage is not a contract, involving merely an exchange of goods and services. Rather, marriage is a covenant, involving an exchange of persons. Kippley's argument was that every covenant has an act whereby the covenant is enacted and renewed; and the marital act is a covenant act. When the marriage covenant is renewed, God uses it to give new life. To renew the marital Covenant and use birth control to destroy the potential for new life is tantamount to receiving the Eucharist and spitting it on the ground.”