At the same time that much is required of us in the way of duty and obedience, we are told in the Scripture, and find it by experience, that of ourselves we can do nothing. To that end, unless the precept of the covenant is founded in a promise of giving grace and spiritual strength to us, in accordance with which we may be enabled to perform those duties, the covenant can be of no benefit or advantage to us.
Coxe, Nehemiah; Owen, John. Covenant Theology: From Adam to Christ (Kindle Locations 2832-2834). RBAP. Kindle Edition.