In the past couple of years, I learned to pay attention to my heart rate monitor while running. There is a correlation between how quickly my heart rate elevates and how I will feel in the last quarter of my run. And I learn to stop if it gets too uncomfortable.

In the old days, I would just power through blindly and only stopped when I physically had to. Now, I check the heart rate monitor when the run feels off and adjust accordingly.

I wonder what the equivalent of a heart rate monitor be for faith.

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A prayer: Keep my heart pure