Wherein do Baptism and the Lord's Supper differ from the other ordinances of God?

Baptism and the Lord's Supper differ from the other ordinances of God in that they were specially instituted by Christ to represent and apply to believers the benefits of the new covenant by visible and outward signs.

Proofs

• Baptism and the Lord's Supper differ from the other ordinances of God in that they were specially instituted by Christ. (Matthew 28:19; Matthew 26:26-28)
• to represent and apply to believers the benefits of the new covenant by visible and outward signs. (Acts 22:16; Romans 6:4)

Note: This question is not normally included in the classic list of the Baptist Catechism, but is found in what is commonly called Keach's Catechism.