By believing what you heard
Galatians 3: 5-6 “So again I ask, does God give you his Spirit and work miracles among you by the works of the law, or by your believing what you heard? So also Abraham “believed God, and it was credited to him as righteousness.”
Aside from highlighting the reality that God sometimes does not do things the way we want him to, Genesis 15 also demonstrates the truth that God’s covenant with us is not based in our righteousness, but rather is based on faith.
It’s not Abraham’s moral purity that served as the foundation for God’s covenant. (Remember how he pretended that his wife was his sister?) Instead, Galatians tells us, it was God’s own commitment to that covenant and Abram’s belief in it. (And as we continue on in Genesis, we’ll see that Abraham didn’t even do belief very well.)
So when you consider your covenant with God, what do you assume it’s based on? Don't answer this question too quickly. It’s easy to give the answer we know we’re supposed to give, but when it really comes down to it, what does your life say about what you’re counting on to save you?