John Ritenbaugh, focusing upon the promise of rest alluded to in Hebrews 4:9, emphasizes the need to endure, persevere, overcoming doubts and unbelief—something many of our forebears (described in Hebrews 3 and 4) did not successfully attain. When we become impatient (largely as a result of superimposing our timetable, plan, or understanding over God's), doubts and lack of faith arise. Like Abraham, we (as Abraham's seed) have been called to a life of rootless, unsettled wandering in a pilgrim state, continually on the move, trusting in God to lead us to our ultimate destination: a spiritual life of permanence. Until this ultimate objective (the ever-expanding promises made by God to Abraham- co-heirs of the earth and ultimately the entire creation) occurs, we experience temporary privation, temptation, and seemingly perpetual rootlessness. Thankfully, if we patiently endure the twists and turns, trusting in God's faithfulness to bring to completion what He has started, there will be a time when we will attain the rest we desperately yearn for.
David C. Grabbe: Imagine that you receive a personal summons from a mysterious benefactor. ...
John Ritenbaugh affirms that the New Covenant seals the agreement with the body and blood of Christ, which is consumed inwardly. Partaking of this cup indicates that we are in unity with those in the body—fellow heirs of the world, as Abraham's seed, participating in the death and resurrection of our Savior. We must thoroughly examine ourselves, exercising and strengthening our faith, actively giving love back to God, to avoid taking this solemn event in a careless, irreverent, or nonchalant manner, jeopardizing our relationship with God, our relationship with our brethren, and our Christian liberty.
In Galatians 6, verse 16, the apostle Paul refers to the church as "the Israel of God." Why? Why not "the Judah of God," or "the Ephraim of God" or "the Galilee of God?" Why did God not inspire Paul to call the church by Israel's original name, Jacob—"the Jacob of God?" Charles Whitaker explains.