Obedience

Have you ever tried to find a Biblical text where gratitude or thankfulness is the explicit motive for obedience to God? Stories like the sinful woman (in Lunke 7:36-50) and the unforgiving servant (in Matt. 18:23-35) come to mind, but neither speaks explicitly of gratitude as a motive.
Why is this explicit motive for obedience - which in contemporary Christianity is probably the most commonly used motive for obedience to God - (almost?) totally lacking in the Bible? Could it be that a gratitude ethic so easily slips over into a debtor's ethic that God chose to protect His people from this deadly motivation by not including gratitude as an explicit motive for obedience?
Instead He lures us into obedience with irresistibly desirable promises of enablement (Jer. 31:33; Ezek. 36:27; Matt. 19:26; Rom. 6:14; 1 Cor. 1:8-9; Gal. 5:22; Phil. 2:13, 4:13; 1 Thess. 3:12; Heb. 13:21) and divine reward (Lunke 9:24; 10:28; 12:33; 16:9, 25; 10:35-36; Heb. 11:24-26; 12:2; 13:5-6).

John Piper, Brothers, We Are Not Professionals, pg. 34-35