The Lord’s Supper is not simply a sign pointing us to think of God, the sacrifice of Christ, and our adoption into His family, but is a visible sign of things invisible. Yes, partaking in the Lord’s Supper does lead our hearts to remembering the promises of God, however this is not the reason we partake in the sacraments. The Spirit is present in our celebration of the Sacraments. In discussing Q&A 25 in the Heidelberg Catechism, Kevin DeYoung says,
“[Baptism and the Lord’s Supper] do not create faith; rather, they confirm it, make us understand the gospel promises more clearly and assure us of our salvation…the sacraments are meant to nourish our faith, strengthen us, prop us up, and assure us of God’s favor…[God’s] given us the sacraments that we might see, smell, taste, and touch the same promises of the gospel we hear proclaimed in the preaching of the Word.”
The sacraments confirm the truths of God’s Word. This is why the Lord’s Supper is not to be done apart from the preaching of the Word of God, which is God-breathed. The Spirit works in us through the Word and the sacraments collectively. Only those who have been justified by the Spirit can properly understand the Word of God. The sacraments then build upon the gospel message and nourish the souls of believers. If the Spirit reveals truth, those without the Spirit in them are incapable of responding to the gift of grace that is given in the sacraments.
God alone works in the Lord’s Supper. The Lord’s Supper is not about what we are remembering, but about what God is confirming. The Lord’s Supper is not about our faithfulness in partaking in them, but about God’s faithfulness while we partake. Though it is not about what we do, it is still important that we partake in them. Jesus commanded His followers to partake in the Lord’s Supper.
 Kevin DeYoung, The Good News We Almost Forgot: Rediscovering the Gospel in a 16th Century Catechism (Chicago, Illinois: Moody Publishers, 2010) 125.
 Matthew 26:26-28, Mark 14:22-25, Luke 22:14-20