Wherein God, willing more abundantly to shew unto the heirs of promise the immutability of his counsel, confirmed it by an oath: That by two immutable things, in which it was impossible for God to lie, we might have a strong consolation, who have fled for refuge to lay hold upon the hope set before us: Which hope we have as an anchor of the soul, both sure and stedfast, and which entereth into that within the veil;– Heb. 6:17-19.
The "heirs of promise" have scriptural grounds for assurance and "strong consolation" in Christ. God gives to us these eternal supports to build us up in the faith of God's elect (Titus 1:1). Notice!
1). God's immutable counsel. That is His eternal decree to accomplish the salvation of His people to the praise of the glory of His grace (1Cor. 1:30-31). His decree or purpose is eternal and unchanging as His own character (Mal. 3:6). The Lord Jesus Christ was delivered for our sin according to the determinate counsel of God (Acts 2:23; Rev. 13:8). Our wise God is working everything out in our salvation to counsel of His own sovereign will (Eph. 1:9-12; Rom. 11:36).
2). God's confirmation by His oath. Interposing Himself or binding Himself and laying Himself under obligation as our Surety (Heb. 7:22), Sacrifice (Heb. 13:20) and Mediator (1Tim.2:5; Heb.8:6) of the covenant promise to secure our everlasting salvation in Jesus Christ (Heb.9: 12). Through Christ's adoption of grace (Gal.4:4-6), the "heirs of promise" receive the whole inheritance of grace now and all glory hereafter (Heb. 6:12; Rom. 8:16-17; 1Peter 1:3-5).
3). God's refuge of hope set before us. The Lord Jesus Christ Himself is that refuge (Psa. 62:5-8). This refuge is set before in the preaching of the gospel (Gal.3:1; Rom. 1:16). Our hope and refuge of salvation is revealed in the person of Christ, Who entered into glory for us and is seated on the throne (Heb. 7:19). His atonement (Heb. 1:3) and His enthronement is our eternal refuge and everlasting hope (Heb. 7:25).
4). God's anchor for our soul, that is sure and steadfast. Now an anchor is used to secure the ship, to keep it safe in the storm and to prevent it from drifting, being held fast by something outside itself. Even so, the Lord Jesus Christ is that anchor of our soul, sustaining us and keeping us on the stormy sea of this troubled world (John 10:27-30). Surely, there is nothing both sure and steadfast in us (Psa. 39:5). However, our assurance of salvation rests upon the weight of the anchor that is anchored on the throne of God, within the Holy of Holies in the heavens (Heb. 9:24). Jesus Christ enthroned, ever living to intercede for us, to appear for us, is that anchor and security of our salvation (Rom. 8:32-35).