In Psalm 103 alone we find that various English translations use different descriptive words to describe the Love of God:
Steadfast (ESV)
Faithful (CSB)
Abounding (NIV)
Unfailing (NLT)The words used intend to point us to the love of God that is UNCHANGING, UNCAUSED, UNDESERVED and which is INCOMPREHENSIBLE
Steadfast = firmly fixed; immovable; not subject to change
"Our Father in Heaven, we (your children) are often troubled, hearing within us at once the affirmations of faith and the accusations of conscience. We are sure that there is in us nothing that could attract the love of One as holy and just as You are. Yet You have declared Your unchanging love for us in Christ Jesus. If nothing in us can win Your love, nothing in the universe can prevent You from loving us. Your love is uncaused and undeserved. You alone are the reason for the love with which we are loved. Help us to believe in the intensity, the eternity of the love that has found us. Then love will cast out fear and our troubled hearts will be at peace, trusting not in what we are but in what You have declared Yourself to be. AMEN."
-Prayer adapted from A.W. Tozer the Knowledge of the Holy