Isaiah 40:4-5 in the New King James Versions says this: Every valley shall be exalted. And every mountain and hill brought low; The crooked places shall be made straight. And the rough places smooth; The glory of the Lord shall be revealed, And all flesh shall see it together; For the mouth of the Lord has spoken.” This is just one of the thousands of promises in scripture that are made “yes” and “amen” in Christ. It is the Spirit of Christ that makes all your promises sure and certain.