Have you ever considered Luke 13:24? In response to someone asking if only a few are saved, Jesus says, "Strive to enter through the narrow door." What does that mean? And why does Jesus say only a few will do so? What does Hebrews also say? "Let us." How do you get in? By what? Striving. Now look at Hebrews 4:3: "We who have believed." Anybody feel better now? Here's the thing—apparently, the author of Hebrews believes that making every effort to labor to enter God's rest and believing to enter God's rest are not incompatible. Striving and believing go hand in hand.