Give thanks. We are each blessed in many ways, and to acknowledge God as the ultimate giver of all we have is necessary and appropriate.
Keep focus on what matters most. Reminds us that God is center of all life — not me personally. It is so easy to fall into all kinds of selfishness. Being at Mass is all about God and putting him first in our lives.
God says we should! We are called to keep holy the sabbath as a way of honoring God. Human life requires care of body, mind, and spirit. We cannot thrive if we are not in a personal and growing relationship with Jesus.
Mutual support. We gather as a community, because mature faith is not just a private matter. We need the support of others, and they need us.
Urgency of praying the Mass for the salvation of the world, as spiritual warfare against the powers of Evil.