Think of all of the reasons why people lie. Even if God could lie, He would have no motivation. He can gain nothing by lying. Everything He wants to have happen, happens. Every word He says is true. He's afraid of nothing, and He's right about everything. He doesn't forget anything. Nothing about Him ever changes. He is a Rock-He's God!
Because He never lies, when God says something, you can be sure He'll do it. So when He says we are "heirs of the promise," He wants us to be convinced of His faithfulness.
When God fulfilled His promise to Abraham, He made room for you there, too. Galatians 3:29 says, "If you are Christ's, then you are Abraham's offspring, heirs according to the promise." So, if by faith you have trusted in Christ for forgiveness and eternal life, you're in on the promises God has made. The writer of Hebrews confirmed our part in God's promises by highlighting the "unchangeable character of his purpose." We may waver and wander; God is always on task and on track. Both His promises and His character are "unchangeable"!
On the opposite end of the spectrum is Satan, the ultimate antithesis of God. While God is the best truth teller, Satan is the worst liar. John 8:44 says, "[Satan] is a liar and the father of lies." He cannot tell the truth. Satan will never even mention the truth to you unless it is wrapped around a deceptive lie. That was the tactic he used with Jesus when they met in the wilderness (Matthew 4:1-11). The devil quoted Scripture to Jesus, but only to twist it for his manipulative purposes.
You can't count on anything Satan tells you; but you can rest the full weight of your life on God and His Word.
If you think about it, you can probably come up with a number of promises God is keeping right now. Take a few minutes to list them-God's promises are your hope. He wants you to rest in His absolute reliability so that "we who have fled for refuge might have strong encouragement to hold fast to the hope set before us."
