Gratuitous, not Merit
Are good works pleasing and acceptable to God and do they obtain from God the reward of life? For this we willingly grant to our opponents, provided a gratuitous and not a due reward is meant.
Francis Turretin, Institutes of Elenctic Theology, ed. James T. Dennison Jr., trans. George Musgrave Giger, vol. 2 (Phillipsburg, NJ: P&R Publishing, 1992–1997), 714.