It's easy to look at our faith through an emotional lens. Are you on an emotional high, or an emotional low? Are you on a mountaintop, or are things silent in the valley? What happens to your faith when you aren't "feeling it."
By basing our assurance on the promises of God, which we not only hope for in the future but live in now, the Christian can finally rest in the comfort that they are both saved and not responsible for their own salvation.