Thomas Watson on the Lord's Supper as an Effectual Means of Grace

The Lord's Supper works for good. It is an emblem of the marriage-supper of the Lamb (Rev. 19:9), and an earnest of that communion we shall have with Christ in glory. It is a feast of fat things; it gives us bread from heaven, such as preserves life, and prevents death. It has glorious effects in the hearts of the godly. It quickens their affections, strengthens their graces, mortifies their corruptions, revives their hopes, and increases their joy. -- Thomas Watson, All Things For Good, p. 20