This morning I studied Psalm 57. Psalm 57:7 in the English Standard Version reads:
My heart is steadfast, O God,
My heart is steadfast!
I will sing and make melody!
Those words struck hard. My heart is not steadfast. I doubt. I worry. I despair. Like the words of the hymn, “Prone to wonder, Lord, I feel it. Prone to leave the God I love.”
How can a heart be steadfast? David had every reason to feel as I did this morning when he wrote this Psalm. In fact, he had more reason. He, the man anointed to become king, was hiding in a cave from jealous King Saul. David likely wrote this Psalm around the events of either 1 Samuel 22:1 or 1 Samuel 24. God anointed David for kingship, but instead, David was hiding like a criminal. The quickest way out was to compromise his beliefs and to kill God’s anointed King. He would not do so. Despite his circumstances, his heart was steadfast. How could that be? A few other verses point us toward understanding.
I cry out to God Most High, to God, who fulfills his purpose for me.
He will send from heaven and save me; he will put to shame him who tramples on me. God will send out his steadfast love and his faithfulness. (vv. 2-3)
For your steadfast love is great to the heavens, your faithfulness to the clouds. (v. 10)
David’s heart was steadfast because of his faith in the steadfastness of God. God would be faithful to fulfill His promise, His purpose for David’s life. David trusted in God’s constant love and perfect, unchanging nature. David had faith because even hiding in a dark cave he could see the light of God’s faithfulness. When I was younger, I used to have a poster hanging above my bed. It was a picture of a tall mountain with words written above, “Our faith does not rest in our feelings: it rests in the unshakeable character of God.”
Steadfast hearts do not come from willpower or training. They come from resting in God and His unchanging love.