The covenant as ground for arguing with God

"Remember that it is part of the Lord's covenant that...thou mayest serve him in righteousness and holiness all the days of thy life...[so] go to the Lord, and beseechest him to make good his covenant." Furthermore, when the believer was tempted with a trial of any sort, he was addressed like this: "if thou lie under any pressure, any calamity, any cross, any disease, any affliction...go to God now, and tell him it is part of his covenant to deliver thee, and...take no denial, though the Lord may defer long, yet he will do it, he cannot choose; for it is his covenant."
~John Preston (1692), as quoted by Peter Golding in Covenant Theology: The Key of Theology in Reformed Thought and Tradition