Gratitude is a mark of being a Christian, because knowing God must produce thankfulness in the heart of the believer. The work of God's redemption is the ground for our thankfulness. It is through thankfulness that we fight against legalism.
This article is about prayer. It considers the place of prayer in the Christian life, as the most important part of our gratitude. It notes the different aspects of prayer, such as thanksgiving, praise, and confession of sin. The author also looks at the importance of faith in prayer, a pure conscience in prayer, corporate prayer, and prayer meetings.
We must be careful not to make our gratitude towards God the ground for our life of obedience. We don't obey because we feel obliged to express thankfulness. However, gratitude does motivate obedience.