God has made a covenant with us. He is faithful to that covenant. “For the word of the LORD is upright, And all His work is done in faithfulness” (Psalm 33:4 NASB). His covenant with us is the New Covenant sealed with the blood of the cross (Mt 26:28). We hold our faith in His promises, in full confidence, without wavering, for we know “He is faithful that promised” (Heb 10:23). Our Faithful King is reliable. The one life that God has given you, trust it completely to him.
“Know therefore that the LORD your God, He is God, the faithful God, who keeps His covenant and His lovingkindness to a thousandth generation with those who love Him and keep His commandments.” Deuteronomy 7:9 (NASB)
