Article 29 — Of the Wicked which eat not the Body of Christ in the use of the Lord’s Supper
“Sometimes it is only when you sit down and do a worked example that you understand a truth thoroughly. When I was 15 my local Roman Catholic priest asked me to choose whether to be a Roman Catholic or an Anglican. As we discussed Scripture and Salvation the worked example of just one person, Mary the mother of Jesus, was very helpful to me. If she was sinless then I should be a Catholic; if she was sinful like everybody else then I should be a Protestant.
The example of ‘the wicked… in the use of the Lord’s Supper’ does the same job with the Sacraments. …”
– At the Church Society blog, Charlie Skrine looks at Articles 29.