When a truth rests in our heart, it means that how we live will be different because of it. First, someone understands the truth in their head. Then they believe it in their heart. Then they bear out that belief through the actions of their body. In reflecting on the results of their actions, they gain a deeper understanding, and the cycle repeats.
Thankfulness is not just an action we perform, but rather a disposition of life that, Lord willing, increases over time and shapes our responses to our experiences more and more readily. Jesus taught us to pray, “Give us this day our daily bread” (Matthew 6:11). That daily petition is completed by daily gratitude for the daily bread God does supply, tracing the pattern on our hearts until the thankfulness comes easy, like the fit of a well-worn pair of shoes.